Aircraft Manufacturers
- 3I, Iniziative Industriali Italiane – Italy
- 3Xtrim Aircraft Factory (Zaklady Lotnicze 3Xtrim Sp z oo) (Poland) – From Wytwórnia i Naprawa Konstrukcji Lekkich 1999, currently operational
- Aachen Flugzeugbau (Germany) – founded 1914, renamed Aachener Segelflugzeugbau in 1921
- Abrams Air Craft Corporation (US), formed 1937, defunct 1940
- ABS Aerolight, Sérignan-du-Comtat, France
- ABS, ABS Aircraft – Germany, (1985–?)
- ABS, ABS Aircraft AG – Switzerland, (1985–?)
- AC Mobil 34, AC Mobil 34 – France
- ACAZ – Ateliers de Construction Aéronautique de Zeebruges, Belgium
- ACBA, Aéro Club de Bas Armagnac – France
- Ace, Ace Aircraft Manufacturing and Supply – United States
- Ace, Ace Aircraft Manufacturing Company – United States, (1929–1931) > Corben Aircraft Company
- Ace, Ace Aircraft Manufacturing Inc – United States
- Aceair, Aceair SA – Switzerland
- Aces High, Aces High Light Aircraft Ltd – Canada
- Advance Thun, Thun, Switzerland
- ACS, Advanced Composites Solutions – United States
- ACME, Air Craft Marine Engineering – United States, (1954–?)
- Airdale Sportplane and Supply, Rhinelander, Wisconsin, United States
- Airo Aviation, Ras Al Khaimah Free Trade Zone, United Arab Emirates
- Acme, Acme Aircraft Corp – United States, (1929–?)
- Acro Sport, Acro Sport Inc – United States, (?-present)
- AD Aerospace, AD Aerospace Ltd – United Kingdom
- Aero East Europe, Kraljevo, Serbia
- ADA, Aeronautical Development Agency – India, (1984–present)
- Aero Nord, Lorgies, and later Bénifontaine, France
- Adam (1), Roger Adam – France, (1948–1955)
- Adam (2), Adam Aircraft Industries LLC – United States, (1998, defunct 2008) (AAI)
- Adamoli-Cattani, Adamoli-Cattani – Italy
- Adams Aero, Adams Aeronautics Company, Inc – United States
- Adams, Adams Industries Inc – United States
- Adams-Toman, Adams-Toman Aircraft Co – United States
- Adams-Wilson, Adams-Wilson Helicopters Inc – United States
- Adaro, Adaro – Spain
- ADC Aircraft, Aircraft Disposals Company – United Kingdom, (1920–1930)
- Adcox, Adcox Aviation Trade School – United States
- Adkisson, Earl and Jerry Adkisson – United States
- Ader, Clement, France, (1886–1897)
- Adler, Adler (Adlerwerke vorm Heinrich Kleyer) – Germany, (1934–?)
- Admiralty, British Admiralty Air Department – United Kingdom, (AD)
- Advanced Aerodynamics and Structures, Inc. (AASI) (US) – founded 1989, renamed to Mooney Aerospace Group in 2002
- Advanced Aeromarine, Advanced Aeromarine – United States, > Keuthan Aircraft
- Advanced Aircraft Corporation (AAC) – United States
- Advanced Amphibious Aircraft (AAA) – Germany/Italy, (1988–1994)
- Advanced Aviation, Advanced Aviation Inc – United States
- Advanced Soaring Concepts, Advanced Soaring Concepts – United States
- Adventure Air, Adventure Air – United States
- Adventure SA, Méré, Yonne, France
- AD-Y, Antonov Dnipropetrovsk-Pivdenmash – Ukraine
- Aequs, Aequs Aerospace – India
- AEA, Aeronautical Engineers Australia Research Pty Ltd – Australia, (1978–present)
- AEA, Aerial Experiment Association – Canada, (1907–1909) > Curtiss Aeroplane and Motor Company
- AEC, Aircraft Engineering Corp – United States
- AEG, Allgemeine Elektrizitäts-Gesellschaft – Germany, (1910–1918) (General Electricity Company)
- AEKKEA-RAAB, AEKKEA – Greece (1935–1940)
- AER, Aer Aircraft Corp. – United States
- Aer Lualdi, Aer Lualdi & C SpA – Italy
- Aer Pegaso, Aer Pegaso – Argentina
- Aerauto, Aerauto – Italy, (1950–1953)
- Aereon, Aereon – United States, (1967–?)
- Aerfer, Aerfer-Industrie Aerospaziali Meridionali SpA – Italy, (1955–1969) > Aeritalia
- Aerfer, Aerfer-Industrie Meccaniche Aeronautiche Meridionali SpA – Italy
- Aerfer-Aermacchi, see AERFER and AERMACCHI – Italy
- Aerial Distributors, Aerial Distributors – United States, (1967–?)
- Aerial Service Corporation, Aerial Service Corporation – United States, (1920–?) > Mercury Aircraft
- Aériane, Aériane – Belgium
- Aeritalia, Aeritalia-Società Aerospaziale Italiana pA – Italy, (1969–1981) > Alenia Aeronautica
- Aeritalia-Aermacchi, see AERITALIA and AERMACCHI – Italy
- Aermacchi, Aermacchi SpA – Italy, (1913–present)
- Aermatica Spa, Italy, (2008–present)
- ‘Aermacchi, Aeronautica Macchi SpA – Italy
- Aero (1), Aero Design and Engineering Company – United States, (1944–1960) > Rockwell
- Aero (2), Aero Vodochody AS – Czech Republic, (1994–present)
- Aero (2), Aero Vodochody Národní Podnik – Czechoslovakia/Czech Republic, (1919–1994)
- Aero (3), Aero Sp z oo – Poland
- Aero Adventure, Aero Adventure Inc – United States
- E.R.O. Aircraft Services, LLC, United States – manufacturer of Lake amphibian aircraft
- Aero Boero, Aero Boero SA – Argentina, (1952–present)
- Aero Boero, Aero Boero SRL – Argentina
- Aero Boero, Aero Talleres Boero SRL – Argentina
- Aero Bravo, Aerobravo Industria Aeronautica Ltda – Brazil, (1993–present)
- Aero Commander, Aero Commander Inc – United States
- Aero Composites, Aero Composites – United States
- Aero Design Associates – United States
- Aero Designs, Aero Designs Inc – United States
- Aerodyne Technologies, Talloires, France
- Aero Gare, Aero Gare – United States
- Aero Jaen, Aeronautica de Jaen – Spain
- Aero Kuhlmann, Aero Kuhlmann – France
- Aero Mercantil, Aero Mercantil SA – Colombia
- Aero Mirage, Aero Mirage Inc – United States
- Aero Mod, Aero Mod General – United States
- Aero Resources – US
- Aero Spacelines, Aero Spacelines Inc – United States, (1961–1974) > Tracor
- AeroCad, AeroCad Inc – United States
- Aero-Cam, Aero-Cam Pty Ltd – (South Africa)
- Aerocar, Aerocar Inc – United States
- Aerocar International, Aerocar International – United States, (1945–1961)
- Aérocentre, Société Nationale de Constructions Aéronautiques du Centre – France, (SNCAC)
- Aerochute International, Coburg North, Victoria, Australia
- Aero-Club, Aero-Club der Schweiz – Switzerland
- Aerocomp, Aerocomp Inc – United States
- Aero-Composites, Aero-Composites Technologies Inc – United States
- Aero-Craft, Aero-Craft – Unknown
- Aero-Difusión, Aero-Difusión SL – Spain (1955– )
- Aérodis, Aérodis SARL – France
- Aero-Flight, Aero-Flight – United States
- Aerion Corporation – United States
- Aero-Jodel, Aero Flugzeugbau Hubert Zuerl – Germany
- Aerokopter, OOO Aerokopter – Ukraine
- AeroLites, Aerolites Inc – United States
- Aeromarine, Aeromarine Plane and Motor Co. – United States, (1908–1935) (Prior to 1914 was the Boland Aeroplane and Motor Co.) > Burnelli
- Aeromarine-LSA, South Lakeland Airport, Florida, United States
- Aeromere, Aeromere SpA – Italy
- Aeromot, Aeromot Industria Mecanico-Metalurgica Ltda – Brazil
- Aeromot, Aeronaves e Motores SA – Brazil
- Aeronautica Agrícola Mexicana SA (AAMSA) (Mexico) – founded 1971, dissolved 1984
- Aeronautical Engineering Co., Aeronautical Engineering Co. – United States
- Aeroneering – United States
- Aeronca, Aeronautical Corporation of America – United States, (1928–1951)
- Aeronca, Aeronca Manufacturing Corporation – United States
- Aeroplastika, Aeroplastika – Lithuania
- Aeropract, Aeropract JSC – Russia
- Aeropract, KB Aeropract – Russia
- Aeropract, LM Aeropract Samara – Russia
- Aeropract, OKB Aeroprakt – Russia
- Aeropract, Aeroprakt Firma – Ukraine
- Aeropract, Aeroprakt ooo – Ukraine
- Aeropro, Aeropro sro – Slovakia
- Aeroprogress, Aeroprogress Corporation – Russia
- Aeroric, Aeroric Nauchno-Proizvodstvennoye Predpriyatie OOO – Russia
- Aero-Service Jacek Skopiński, Warsaw, Poland
- AEROSPACE MANUFACTURING Inc United States
- Aeros, Aeros – Ukraine
- Aerospace General – (US)
- Aérospatiale, Société Nationale Industrielle Aerospatiale – France, (1970–1999) (SONACA) > Aérospatiale-Matra
- Aérospatiale-Matra, Aérospatiale-Matra – France, (1999–2000) > EADS
- Aerospool, Aerospool spol sro – Slovakia
- Aerosport, Aerosport Inc – United States
- Aerosport OY, Keila, Estonia
- Aerostar, SC Aerostar SA – Romania
- Aerostar Aircraft, Aerostar Aircraft Corporation – United States
- Aérostructure, Aérostructure SARL – France
- Aerosud, Aerosud – (South Africa)
- Aerotaller, Aerotaller – Argentina
- Aerotec, Aerotec SA Industria Aeronáutica – Brazil, (1962–1987)
- Aerotechnik, Aerotechnik CZ SRO – Czech Republic
- Aerotécnica – Spain
- Aerotek (1), Aerotek Inc – United States
- Aerotek (2), Aeronautical Systems Technology – (South Africa)
- Aero-Volga, NPO Aero-Volga – Russia
- Aesl, Aero Engine Services Ltd – New Zealand
- AFIC, AFIC Pty Ltd – (South Africa)
- AFU – Switzerland
- Ag-Cat, Ag-Cat Corporation – United States
- AGO Flugzeugwerke, Ago Flugzeugwerke – Germany
- Agro-Copteros, Agro-Copteros Ltda – Colombia
- Agrolot, Fundacja Agrolot – Poland
- Agrolot, Wyposazen Agrolotniczych – Poland
- Agusta, Agusta SpA – Italy, (1907–present)
- Agusta, Agusta, Division of Leonardo – Italy
- Agusta, Costruzioni Aeronautiche Giovanni Agusta SpA – Italy
- Ahrens, Ahrens Aircraft Corp. – United States (1975–?)
- AI(R), Aero International (Regional) – UK/France/Italy
- AIAA, Atelier Industriel de l’Aéronautique d’Alger – Algeria, (1948–1960)
- Aichi Kokuki, Aichi Kokuki KK – Japan, (1931–1945) (Aichi Aircraft Company)
- AICSA, Aero Industrial Colombiana SA – Colombia
- AIDC, Aero Industry Development Center – Republic of China (Taiwan)
- AIDC, Aerospace Industrial Development Corporation – Republic of China (Taiwan)
- AIEP, Aeronautical Industrial Engineering and Project Management Company Ltd – Nigeria
- AII, Aviation Industries of Iran – Iran, (1993–present)
- AIL, Aeronautics (India) Ltd – India
- AIR, Aircraft Investor Resources LLC – United States
- Air & Space, Air & Space America Inc – United States
- Air & Space, Air & Space Manufacturing Inc – United States
- Air Command, Air Command International Inc – United States
- Air Parts, Air Parts (NZ) Ltd – New Zealand
- Air Products, Air Products Company Inc – United States
- Air Tractor, Air Tractor Inc – United States, (1972–present)
- Airbridge – Moscow, Russia
- Airbus, Airbus SAS – European Union, (1970–present)
- Airbus, GIE Airbus Industrie – European Union
- Airco, Aircraft Manufacturing Company – United Kingdom, (1912–1920) > de Havilland
- Airconcept, Airconcept Flugzeug und Gerätebau GmbH und Co KG – Germany
- Aircraft Armaments Incorporated (AAI) (US) – founded 1950, renamed to AAI Corporation 1985
- Aircraft Cooperative, Aircraft Cooperative – United States
- Aircraft Designs, Aircraft Designs Inc – United States, (1986–present) (ADI)
- Aircraft Hydro-Forming, Aircraft Hydro-Forming Inc – United States
- Aircraft Parts, Aircraft Parts and Development Corporation – United States
- Aircraft Spruce & Specialty Co, Aircraft Spruce & Specialty Company – United States
- Aircraft Technologies, Aircraft Technologies Inc – United States
- Airfer, (Airfer Paramotores, Paramotores Air-Future, S.L.), Pontevedra, Spain
- Air-Fouga, Air-Fouga – France
- Airframes Unlimited, Athens, Texas, United States
- AirLony Aircraft Company – Czech Republic
- Airmak, Capua, Italy
- Airmaster, Airmaster Inc – United States
- Airplane Factory, The, Tedderfield Airpark, Eikenhof, Johannesburg South, South Africa
- Air Plum, Fourilles, France
- Airspeed, Airspeed Ltd – United Kingdom, (1931–1951) > de Havilland
- Air-Sport, Zakopane, Poland
- Airsport sro, Zbraslavice, Czech Republic
- Air Sylphe, Villereau, Nord, France
- Airtech (1), Airtech Canada Aviation Services Ltd – Canada
- Airtech (2), Aircraft Technology Industries – Indonesia/Spain
- Airtime Products, Airlie Beach, Queensland, Australia
- Airwave Gliders, Fulpmes, Austria
- Airways International, United States
- AISA, Aeronautica Industrial SA – Spain
- AJEP, AJEP Developments – United Kingdom
- AJI, American Jet Industries Inc – United States
- Akaflieg Berlin, Akademische Fliegergruppe Berlin eV – Germany
- Akaflieg Braunschweig, Akaflieg Braunschweig – Germany
- Akaflieg Darmstadt, Akademische Fliegergruppe Darmstadt eV – Germany
- Akaflieg Hannover, Akaflieg Hannover – Germany
- Akaflieg Karlsruhe, Akademische Fliegergruppe Karlsruhe eV – Germany
- Akaflieg Munchen, Akademische Fliegergruppe München eV – Germany
- Akaflieg Stuttgart, Akaflieg Stuttgart – Germany
- Akron, Akron Aircraft Company Inc – United States
- Akrotech, Akrotech Aviation Inc – United States
- Akrotech Europe, Akrotech Europe SA – France
- Alanne, Pentti Alanne – Finland
- Alaparma – Italy
- Albastar Ltd, Zgornje Gorje, Slovenia
- Albatros, Fabrika aviona Albatros – Yugoslavia
- Albatros Flugzeugwerke, Albatros Flugzeugwerke – Germany, (1910–1931) > Focke-Wulf
- Albatros-Flugzeugwerke, Ostdeutsche Albatros Werke – Germany, (East German Albatros Works)
- Albaviation, Corropoli, Italy
- Alenia, Alenia – Italy, (1981–present)
- Alenia, Alenia Aerospazio, Division of Leonardo – Italy
- Alexander Aircraft Company, Englewood/Colorado Springs, Colorado – United States (1926–1932)
- Alfa-M, Alfa-M Nauchno-Proizvodstvennoye Predpriyatie AOOT – Russia
- Alisport, Alisport – Italy
- All American – US
- Alliance Aeroplane Company, Alliance Aeroplane Company Ltd, United Kingdom
- Alliant Aviation, Richland, Michigan, United States
- Alliant Techsystems, Alliant Techsystems – United States
- Allied Aerospace Industries – United States, (?-present)
- Allied Aviation – United States
- Allison, Allison Gas Turbine Division GMC – United States
- Alon, Alon Inc – United States, (1964–1967) > Mooney
- Alpavia, Alpavia SA – France, (1959–1966) > Sportavia-Putzer
- Alpavia, Société Alpavia – France
- Alpha, Alpha – Poland
- Alpi, Alpi Aviation Srl – Italy
- Alpla, Alpla-Werke Alwin Lechner OHG – Austria
- Altair Coelho, Eldorado do Sul, Brazil
- AltiGator (2008–present), Amphios SPRL – Belgium
- Alturair, Alturair – United States
- Alvarez, Joseph P. Alvarez – United States
- Amax, Amax Engineering – Australia
- Ambrosini, Societa Aeronautica Italiana Ing. A. Ambrosini & Companie – Italy, (1934–1958)
- Amc, Aircraft Manufacturing Company – United States, (1917–1920)
- Amd, Aircraft Manufacturing and Development Company Inc – United States
- Ameagle, AmEagle Corporation – United States
- American Aerolights, United States
- American, American Aviation Corporation – United States
- American Affordable, American Affordable Aircraft – United States, (AAA)
- American Aircraft, American Aircraft Inc – United States
- American Airmotive – United States
- Ameri-Cana Ultralights – Canada
- American Autogyro, American Autogyro Inc – United States
- American Champion, American Champion Aircraft Corporation – United States
- American Eagle, American Eagle Aircraft Corporation – United States
- American General, American General Aircraft Company – United States
- American Homebuilts, Hebron, Illinois, United States
- American Sportscopter, American Sportscopter Inc – United States
- American Utilicraft, American Utilicraft Corporation – United States
- Ameur Aviation SA (or simply “Ameur”) – France
- Ameur Aviation Technologie (or simply “Ameur”) – France
- Amiot, Amiot – France, (1915–1945) (Amiot-Peneau) > Ateliers Aeronautiques de Colombes, SNCAC
- Amoy, Amoy – Unknown, (1930–1935)
- Amphibian Airplanes of Canada (AAC) – Canada, (1998–?)
- AMS-Flight, AMS-Flight DOO – Slovenia
- AMX, AMX International Ltd – Italy/Brazil
- Anahuac, Fabrica de Aviones Anahuac SA – Mexico
- Anatra – Russia
- ANBO – Antanas Gustaitis at the Lithuanian Army Aviation Workshops – Lithuania
- Anderson, Anderson Aircraft Corporation – United States
- Anderson, Earl Anderson – United States
- Anderson-Greenwood, Anderson, Greenwood and Company – United States
- Andreasson, Björn Andreasson – Sweden
- ANF Mureaux, ANF Mureaux – France, (1918–1937) > SNCAN
- Angel, Angel Aircraft Corporation – United States
- Anglin, Anglin Engineering – United States
- Anglin, Anglin Special Aero Planes Inc – United States
- Anglo Normandy, Anglo Normandy Aero Engineering – United Kingdom
- Ansaldo – Italy, (1916–1928)
- Antoinette, Antoinette – France, (1906–1912)
- Antoniewski, Tomek Antoniewski – Poland
- Antonov, Antonov OKB – Ukraine, (1947–present)
- Antonov Company (before 2010 Aviatsijnyy Naukovo-Tekhnichnyy Kompleks Imeni O.K. Antonova) – Ukraine
- AOI, Arab Organisation for Industrialisation, Aircraft Factory – (Egypt)
- Apco Aviation, Caesarea, Israel
- Apex Aircraft – France
- Apollo Ultralight Aircraft, Eger, Hungary
- Applebay Sailplanes, Albuquerque, New Mexico, United States
- Applegate & Weyant, Applegate & Weyant – United States
- Aquaflight, United States (1946)
- Aquila, Aquila Technische Entwicklungen GmbH – Germany
- Arab British Helicopter Company (ABHCO) (Egypt)
- Arado, Arado Flugzeugwerke GmbH – Germany, (1925–1945)
- Arc Atlantique, Arc Atlantique Aviation – France
- Arctic, Arctic Aircraft Company – United States
- Arey, Krasnoyarsk, Russia
- ARDC, Air Force Research and Development Center – Philippines
- Arkhangelski, Arkhangelski OKB – Russia
- Armstrong Siddeley, Armstrong Siddeley – United Kingdom, Possibly engine maker
- Armstrong Whitworth, Sir W. G. Armstrong Whitworth Aircraft Ltd – United Kingdom, (1913–1958) > Hawker Siddeley
- Arnet Pereyra, Arnet Pereyra Aero Design – United States
- Arocet – United States
- Arpin, M. B. Arpin & Co. – United Kingdom
- Arrow (1), Arrow Airplane & Motors Corporation – United States
- Arrow (2), Arrow Aircraft Company – Canada
- Arrow Aircraft, Arrow Airplane Company – United States, (1931–1935)
- Arrow Aircraft Ltd. – United Kingdom
- Arsenal de l’Aeronautique, Arsenal de l’Aeronautique – France, (1936–1953) > SFECMAS
- ARV, ARV Aviation Ltd – United Kingdom
- ASAP, Aircraft Sales & Parts – Canada
- ASJA – Sweden
- ASL, ASL Hagfors Aero AB – Sweden
- Asso Aerei, Asso Aerei Srl – Italy
- Associated Air, Associated Air – United States
- ASTA, Aerospace Technologies of Australia Pty Ltd – Australia, (1987–present)
- Astra, Astra Societe de Constructions Aeronautiques – France, (1909–1921) > Nieuport
- ATB, First Naval Air Technical Bureau (abbreviated Kugisho) – Japan, (1969–1996) > Aeronautical Development Agency
- ATEC v.o.s., Libice nad Cidlinou, Czech Republic
- Ateliers Aeronautiques de Colombes, Ateliers Aeronautiques de Colombes – France, −1945
- Ateliers Aéronautiques de Suresnes (AAS) (France) – founded 1945, now defunct
- Ateliers, Ateliers de Construction Aéronautique de Zeebrugge – Belgium, (1923–1933) (ACAZ) (Zeebrugge Aeronautical Construction Company) (ZACCO)
- Atlantic-Fokker, Atlantic Fokker Corporation (American Fokker) – United States
- Atlas, Atlas Aircraft Company – US (1948)
- Atlas, Atlas Aircraft Corporation of South Africa (Pty) Ltd – (South Africa), (1965–present)
- Atlas, Atlas Aviation (Pty) Ltd – (South Africa)
- Atlas, Atlas Aviation, Division of Denel (Pty) Ltd – (South Africa)
- ATR, GIE Avions de Transport Régional – France/Italy, (1981–present)
- Aubert, Aubert Aviation – France, (1932–1940, 1945–1959)
- Aurora Flight Sciences, Aurora Flight Sciences Corp. – United States (1989–present)
- Aurore Sarl, Sauvagnon, France
- Auster, Auster Aircraft Ltd – United Kingdom, (1946–1961)
- Austflight, Austflight ULA Pty Ltd – Australia
- Austin Motors, Austin Motors Ltd. – United Kingdom
- Australian Aircraft & Engineering, Australian Aircraft & Engineering – Australia, (1910–1923)
- Australian Aircraft Consortium, Australian Aircraft Consortium – Australia, (1982–1985) (A joint venture between the Government Aircraft Factory, the Commonwealth Aircraft Corporation and Hawker de Havilland.) > Hawker de Havilland
- Australian Aircraft Kits, Taree, New South Wales, Australia
- Australian Autogyro – Australia (1984–?)
- Australite, Australite Inc – United States
- Auto-Aero, Auto-Aero – Hungary
- AutoGyro GmbH, Hildesheim, Germany
- Av8er Limited, Woodford Halse, Northamptonshire, United Kingdom
- Avcraft, AvCraft Aviation LLC – United States
- AVE, Advanced Vehicle Engineers – United States, (1971–1973)
- Avia (1), Azionari Vercellese Industrie Aeronautiche – Italy
- Avia (2), Avia-Zavody Jirího Dimitrova – Czechoslovakia, (1919–1958)
- Avia (3), Nauchno-Proizvodstvennoe Obedinenie Avia – Russia
- Avia Baltika, Avia Baltika Aviation Ltd – Lithuania
- Aviabellanca, AviaBellanca Aircraft Corporation – United States, (1983–present)
- Aviafiber – Switzerland
- Aviamilano, Aviamilano Costruzioni Aeronautiche SRL – Italy, (1959–?)
- Aviastroitel, AviaStroitel Ltd – Russia
- Aviat, Aviat Aircraft Inc – United States
- Aviat, Aviat Inc – United States
- Aviatik, Österreichische-Ungarische Flugzeugfabrik Aviatik – Austria, (1910–1918) (Automobil und Aviatik)
- Aviatika, Aviatika JSC – Russia
- Aviatika, Kontsern Aviatika – Russia
- Aviation, Aviaton Nauchno-Proizvodstvennaya Aviatsionnaya Firma – Russia
- Aviation Association Ilyushin (Russia) – Formed 1992
- Aviation Composite Technology, Aviation Composite Technology – Philippines, (1990–?) (ACT)
- Aviation Development, Aviation Development International Ltd – United States
- Aviation Farm, Aviation Farm Ltd – Poland
- Aviation Industries of Iran, Iran
- Aviation Normand Dube, Sainte-Anne-des-Plaines, Quebec, Canada
- Aviation Scotland, Aviation Scotland Ltd – United Kingdom
- Aviation Traders, Aviation Traders (Engineering) Ltd – United Kingdom, (1949–1962)
- Avibras, Avribras Aeroespacial SA – Brazil, (1963–1967) (Aviation Brazil)
- Avid, Avid Aircraft Inc – United States
- Avioane Craiova, SC Avioane Craiova SA – Romania
- Aviones Colombia, Aviones de Colombia SA – Colombia
- Avions Fairey, Avions Fairey SA – Belgium, (1931–1978) > Aêrospatiale
- Avions Fairey, Fairey SA – Belgium
- Avions JDM – France
- Aviotechnica, Aviotechnica Ltd – Bulgaria/Russia
- Avipro, AviPro Aircraft Ltd – United States
- AVIS, AVIS Aircraft – Unknown, (1917–1923) -1941
- Avro, A. V. Roe & Company – United Kingdom, (1910–1963) > Hawker Siddeley
- Avro, A. V. Roe & Company Ltd – United Kingdom
- Avro, Avro International Aerospace Ltd – United Kingdom
- Avro Canada, Avro Aircraft Canada – Canada, (1945–1962) > Hawker Siddeley
- Avtek, Avtek Corporation – United States
- Ayres, Ayres Corporation – United States, (?-2001) > Thrush Aircraft
- Azalea Aviation, Adel, Georgia, United States
- B/E Aerospace – United States, UK, UAE, www.beaerospace.com
- B&B Manufacturing Company – Valencia, Ca, www.bbmfg.com
- B&W, Boeing & Westervelt – United States, (1916) > Pacific Aero
- Babcock Aircraft Company
- British Aircraft Corporation (BAC) Ltd – United Kingdom, (1959–1977) > British Aerospace
- Bach Aircraft – United States
- Bachem, Bachem – Germany, (1944–1945)
- Back Bone, Tallard, France
- Backcountry Super Cubs, Douglas, Wyoming, United States
- BAE Systems, BAE Systems PLC – United Kingdom, (1999–present)
- BAE Systems Australia, BAE Systems Australia Ltd – Australia
- BAI, Bureau of Aircraft Industry – Republic of China, (1946–1969) > Air Technical Bureau
- Bakeng, Bakeng Aircraft – United States
- Bakeng, Gerald Bakeng – United States
- Ball-Bartoe – United States
- Barkley-Grow, Barkley Grow Aircraft Corporation – United States
- Barnett, Barnett Rotorcraft – United States
- Barr, Barr Aircraft – United States
- Barrows, Bob Barrows – United States
- Bartel – Poland
- Bartlett Aircraft – United States
- Basler, Basler Turbo Conversions Inc – United States
- BAT, British Aerial Transport Co. Ltd. – United Kingdom
- Bay Aviation, Bay – United States
- Bayerische Flugzeugwerke, Bayerische Flugzeugwerke – Germany, (1926–1938) (BFW – Bavarian Aircraft Works) > Messerschmitt
- BDC Aero Industrie, Lachute, Quebec, Canada
- Bd-Micro, BD-Micro Technologies Inc – United States
- Beagle, Beagle Aircraft (1969) Ltd – United Kingdom, (?-1970) > Scottish Aviation
- Beagle, Beagle Aircraft Ltd – United Kingdom
- Beagle-Auster, Beagle-Auster Ltd – United Kingdom
- Beardmore, William Beardmore & Co – United Kingdom
- Beaujon Aircraft – United States
- Bede, BD Micro Technologies Inc – United States
- Bede, Bede Aircraft Corporation – United States
- Bede, Bede Aircraft Inc – United States
- Bede, Bede Aviation Corporation – United States
- Bede, Bede Jet Corporation – United States
- Bede, BEDEAmerica Aerosport LLC – United States
- Beech, Beech Aircraft Corporation – United States, (1932–1980) > Raytheon > Hawker Beechcraft
- Beech-Sferma, see BEECH and SFERMA – United States/France
- Beecraft, Bee Aviation Associates, Inc. – United States, (1948–1960)
- Beets, Glenn Beets – United States
- Beijing Keyuan, Beijing Keyuan Light Aircraft Industrial Company Ltd – China
- Belairbus, Belairbus – Belgium, (1979–present)
- Bel-Aire, Bel-Aire Aviation – United States
- Bell, Bell Aircraft Corporation – United States, (1935–1960)
- Bell, Bell Helicopter Company, Division of Bell Aerospace Corporation – United States, (1960–present)
- Bell, Bell Helicopter Textron Inc – United States
- Bell, Bell Helicopter Textron, Division of Textron Canada Ltd – Canada
- Bell, Bell Helicopter Textron, Division of Textron Inc – United States
- Bell-Agusta, Bell-Agusta Aerospace Company – United States/Italy
- Bellanca, Bellanca Aircraft Corporation – United States, (1927–1983) > AviaBellanca
- Bellanca, Bellanca Aircraft Engineering – United States
- Bellanca, Bellanca Inc – United States
- Bellanca, Bellanca Sales Manufacturing Inc – United States
- Bell-Boeing, see BELL and BOEING – United States
- Beneš & Hajn, Beneš & Hajn – Unknown, (1923) > Avia
- Beneš-Mráz – Czechoslovakia
- Bengis, Bengis Aircraft Company (Pty) Ltd – South Africa
- Bensen, Bensen Aircraft Corporation – United States, (?-1987)
- Bereznyak-Isayev, Alexander Yakovlevich Bereznyak and Alexei Mikhailovich Isayev – Soviet Union
- Berger, Hans Berger – Switzerland
- Beriev, Beriev OKB – Russia, (1934–present) (Beriev Aircraft Company)
- Beriev, Berieva Aviatsionnyi Kompaniya – Russia
- Beriev, Taganrogsky Aviatsionnyi Nauchno-Tekhnicheskiy Kompleks Imeni G. M. Berieva – Russia
- Berkut, Berkut Engineering Inc – United States
- Berliner, Berliner Aircraft Co. – United States, (1926–1929) > Berliner-Joyce
- Berliner-Joyce, Berliner-Joyce Aircraft Corp. – United States, (1929–?)
- Bernard, Société des Avions Bernard – France
- Berwick, FW Berwick and Company Ltd. – United Kingdom
- Besson, Besson – France, (1915–1928) > ANF Mureaux
- Best Off, Best Off – France, (?-present)
- Bharat, Bharat Heavy Electricals Ltd – India
- Billie, Billie Aero Marine – France
- Bilsam Aviation, Poznań, Poland
- Binder, Binder Aviatik KG – Germany
- Birdman, Birdman Aircraft, US
- Birdman, Birdman Enterprises, Canada
- Bisnovat, Bisnovat – Russia
- Bitz, Bitz Flugzeugbau GmbH – Germany
- Bitz, Fa. Josef Bitz – Germany
- Blackburn, Blackburn Aircraft Ltd – United Kingdom, (1914–1949) > General Aircraft Ltd
- Blackshape srl, Monopoli, Italy
- Blackwing Sweden, Lund, Sweden
- Blériot, Société Blériot Aéronautique – France, (1906–1914) > Blériot-SPAD
- Blériot-SPAD, Blériot-SPAD – France, (1914–1936) > Sud-Ouest
- Blériot-Voisin, Blériot-Voisin – France, (1903–1906) > Blériot, Voisin
- Bloch, Societé des Avions Marcel Bloch – France, (1930–1936) (1945) > Sud-Ouest, Dassault
- Blohm + Voss, Blohm + Voss – Germany, (1930–1969) > Messerschmitt-Bölkow-Blohm
- Blue Yonder, Blue Yonder Aviation Inc – Canada
- Blume, Walter Blume – Germany
- B-N Group, B-N Group Ltd – United Kingdom, (1964–present) (Britten-Norman)
- Boeing, Boeing Aircraft Company – United States, (1916–present)
- Boeing, The Boeing Airplane Company – United States
- Boeing, The Boeing Company – United States
- Boeing Canada, Boeing Aircraft of Canada Ltd – Canada
- Boeing North American, Boeing North American, Inc. – United States, (1996–present)
- Boeing Vertol, Boeing Vertol Company – United States
- Boeing-Sikorsky, see BOEING and SIKORSKY – United States
- Boeve, Boeve Fiberglass Components Inc – United States
- Bohemia, Bohemia – Czech Republic
- Boisavia, Société Boisavia – France
- Bolkow, Bölkow-Apparatebau GmbH – Germany, (1948–1968) > Messerschmitt-Bölkow
- Bolkow, Bölkow-Entwicklungen GmbH – Germany
- Booth Aerospace North America – United States
- Bombardier, Bombardier Inc – Canada, (1986–present)
- Borel, Etablissements Borel, France > SGCIM
- Boulton & Paul Ltd United Kingdom, (1914–1934)
- Boulton Paul Aircraft Ltd – United Kingdom, (1934–1961)
- Bowers, Peter M. Bowers – United States
- Bradley, Bradley Aerospace – United States
- Brandenburg, Brandenburg – Germany
- Brandli, Max Brändli – Switzerland
- Brantly, Brantly Helicopter Corporation – United States
- Brantly, Brantly Helicopter Industries USA Company Ltd – United States
- Brantly, Brantly International Inc (Helicopter Division) – United States
- Brantly-Hynes, Brantly-Hynes Helicopter Inc – United States, (1975–?)
- Bratukhin, Bratukhin – Russia, (1940–1951)
- Brditschka, H. W. Brditschka OHG – Austria
- Brditschka, HB-Brditschka GmbH & Co KG – Austria
- Breda, Societa Italiana Ernesto Breda – Italy
- Bredanardi, BredaNardi Costruzione Aeronautiche SpA – Italy
- Breguet, Société des Ateliers d’Aviation Louis Bréguet – France, (1911–1969) > Dassault-Breguet
- Brewster, Brewster Aeronautical Corporation – United States, (1932–1946)
- Brian Allen, Brian Allen Aviation – United Kingdom
- Briegleb, Gus Briegleb – US
- Bristol, Bristol Aircraft Ltd – United Kingdom, (1910–1959) > British Aircraft Corporation
- Bristol, The Bristol Aeroplane Company Ltd – United Kingdom
- Bristol Helicopter, Bristol Helicopter Ltd. – United Kingdom, (1944–1969) > Westland Aircraft
- British Aerospace, British Aerospace – United Kingdom, (1977–1999) (BAe) > BAE Systems
- British Aerospace, British Aerospace PLC – United Kingdom
- British Aircraft Company, British Aircraft Company – United Kingdom
- British Aircraft Manufacturing, British Aircraft Mfg. Co. – United Kingdom, (BAMC)
- British Klemm, British Aircraft Klemm Aeroplane Co Ltd. – United Kingdom, > British Aircraft Mfg. Co.
- Britten-Norman, Britten-Norman (Bembridge) Ltd – United Kingdom
- Britten-Norman, Britten-Norman Ltd – United Kingdom, (1964–present)
- BRM Costruções Aeronáuticas, Pero Pinheiro, Portugal
- Brochet, Constructions Aéronautiques Maurice Brochet – France
- Ken Brock Manufacturing, Stanton, California, United States
- Brokaw, Bergon Brokaw – US
- Brooklands, Brooklands Aerospace Ltd – United Kingdom
- Brooklands, Brooklands Aircraft Ltd – United Kingdom
- Brügger, Max Brügger – Switzerland
- Brush Electrical, Brush Electrical Engineering Co. Ltd. – United Kingdom, (Originally Anglo-American Brush Electric Light Corporation)
- Brutsche Aircraft Corporation, Salt Lake City, Utah, United States
- Buchanan, Buchanan Aircraft Corporation Ltd – Australia
- Bucker, Bücker Flugzeugbau GmbH – Germany, (1932–1945)
- Bucker Prado, Bücker Prado SL – Spain
- Bucureşti, Intreprinderea de Avioane Bucureşti – Romania
- Budd Manufacturing, Edward G. Budd Manufacturing Company – United States
- Buethe, Buethe Enterprises Inc – United States
- Buhl, Buhl Aircraft Company – United States
- Bul, Bourgogne Ultra Léger Aviation – France
- Burgess, Burgess Company – United States, (1911–1916) (Originally Burgess Company and Curtis, Inc.)
- Büttner Propeller, Gerald Büttner – Obernkirchen, Obernkirchen, Germany
- Burl’s Aircraft, Chugiak, Alaska – United States, (1982–Present)
- Burnelli, Burnelli Aircraft Co. – United States
- Bushby, Bushby Aircraft Inc – United States
- Itoh, C. Itoh & Co – Japan, (1955–1970) > JAMCO
- CAARP, Cooperatives des Ateliers Aéronautiques de la Région Parisienne – France
- CAB, Constructions Aéronautiques du Béarn – France
- Cable-Price, Cable-Price Corporation – New Zealand
- Cabrinha, Cabrinha Aircraft Corporation – United States
- Cabrinha, Cabrinha Engineering Inc – United States
- CAG, Construcciones Aeronáuticas de Galicia – Spain
- Caldas Aeronautica, Pali, Colombia
- Calipt’Air, Spiez, Switzerland
- Callair, Call Aircraft Company – United States, (1939–1959) > IMCO
- Callair, Callair Inc – United States
- Calumet, Calumet Motorsports Inc – United States
- Camair, Camair Aircraft Corporation – United States
- Camair, Camair Division of Cameron Iron Works Inc – United States
- CAMCO, Central Aircraft Manufacturing Company – China, CAMCO
- Cameron, Cameron & Sons Aircraft – United States
- Campana, Campana Aviation – France
- CAMS, Chantiers Aéro-Maritimes de la Seine – France
- CAMS, Cairns Development Company – United States, (or Cairns Aircraft (E. B. Cams))
- Calumet Motorsports, Lansing, Illinois, United States
- Canada Air RV, Canada Air RV Inc – Canada
- Canadair, Bombardier Aerospace Canadair – Canada, (?-1986) > Bombardier Aerospace
- Canadair, Canadair Group of Bombardier Inc – Canada
- Canadair, Canadair Inc – Canada
- Canadair, Canadair Ltd – Canada
- Canadian Aeroplanes, Canadian Aeroplanes Ltd. – Canada
- Canadian Car & Foundry, Canadian Car & Foundry Co. – Canada
- Canadian Home Rotors, Canadian Home Rotors Inc – Canada
- Canadian Vickers, Canadian Vickers Ltd – Canada
- Canard Aviation – Switzerland
- CANSA, Cansa – Italy
- CANT, Cantiere Navale Triestino – Italy, (?-1931) > CRDA
- CAO/SNCAO, Societe Nationale de Construction Aeronautique de l’Ouest – France
- CAP – Companhia Aéronautica Paulista – Brazil
- CAP Aviation, CAP Aviation – France
- Capella, Capella Aircraft Corporation, Austin, Texas, United States
- Caproni, Caproni – Italy, (1908–1983) > Agusta
- Caproni Vizzola, Caproni Vizzola Costruzione Aeronautiche SpA – Italy
- Carlson, Carlson Aircraft Inc – United States
- CARMAM, Coopérative d’Approvisionnement et de Réparation de Matériel Aéronautique de Moulins – France
- Carplane GmbH, Braunschweig, Germany
- Carriou, Louis Carriou – France
- Carstedt, Carstedt – United Kingdom
- Cartercopters, CarterCopters LLC – United States
- CASA, Construcciones Aeronáuticas SA – Spain
- Caspar, Caspar-Werke – Germany
- Cassutt, Thomas K. Cassutt – United States
- CATA, Construction Aéronautique de Technologie Avancée – France
- Caudron, British Caudron Co Ltd. – United Kingdom, (Last aircraft made in 1919, went into receivership 1924.)
- Caudron, Caudron – France, (1909–?)
- Cavalier, Cavalier Aircraft Corp. – United States, (?-1971) > Piper Aircraft
- CCF, Canadian Car & Foundry Company Ltd – Canada
- CEI, CEI – United States
- Celier Aviation, CA – Poland
- Celair, Celair (Pty) Ltd – South Africa
- Centrair, SA Centrair – France
- Central Aircraft Company, Central Aircraft Company Limited – United Kingdom
- Centrala Flygverkstaden Malmslätt (CFM) – Sweden
- Centrala Verkstaden Malmslätt (CVM) – Sweden
- Centre Est, Centre Est Aéronautique – France
- Century, Century Aircraft Corporation – United States
- CERVA, Consortium Européen de Réalisation et de Vente d’Avions GIE – France
- Cessna, Cessna Aircraft Company – United States, (1927–present)
- Cessna-Roos, Cessna-Roos Aircraft Company – United States, (1927) > Cessna Aircraft
- Clyde Cessna, Clyde Cessna – United States, (1911) (Clyde Vernon Cessna) > Travel Air
- Cessna-Reims, Cessna-Reims – United States/France
- CFA, Compagnie Française d’Aviation – France
- CFM, CFM Aircraft Ltd – United Kingdom
- CFM, Cook Flying Machines, CFM Metal Fax Ltd – United Kingdom
- CFM Air, Ciriè, Italy
- CGS Aviation, Grand Bay, Alabama, United States
- Chadwick, Chadwick Helicopters – United States
- Chalard, Jacques et Renée Chalard – France
- Champion, Champion Aircraft Company Inc – United States, (1954–1970) > Bellanca
- Champion, Champion Aircraft Corporation – United States
- Chance Vought, Chance Vought Aircraft Inc – United States, (1922–1961) > Vought
- Chance Vought, Chance Vought Corporation – United States
- Changhe, Changhe Aircraft Factory – China
- Changhe, Changhe Aircraft Industries Corporation – China
- Changhe, Changhe Aircraft Manufacturing Corporation – China
- Chasle, Yves Chasle – France
- Chayair, Chayair Manufacturing and Aviation – South Africa
- Chengdu, Chengdu Aircraft Industrial Corporation – China
- Chernov, Opytnyi Konstruktorskoye Byuro Chernov B & M OOO – Russia
- Chetverikov, Chetverikov – Russia, (Igor Vyacheslavovich Chetverikov)
- Chichester-Miles, Chichester-Miles Consultants Ltd – United Kingdom
- Chilton, Chilton Aircraft – United Kingdom, (1937–?)
- Chincul, Chincul SACAIFI – Argentina
- Chris Tena, Chris Tena Aircraft Association – United States
- Chrislea, Chrislea Aircraft Co. Ltd. – United Kingdom
- Christen, Christen Industries Inc – United States
- Chu, Major General C.J. Chu – Republic of China
- Cicaré, Cicaré Helicópteros SA – Argentina
- Cierva, Cierva Autogyro Company – United Kingdom, (Juan de la Cierva)
- Circa, Circa Reproductions – Canada
- Cirrus, Cirrus Design Corporation – United States, (1984–present)
- Citroen-Marchetti, Citroen-Marchetti – France
- Civil Aviation Department of India – India
- Claassen, Claassen – United States
- CLASS, Canadian Light Aircraft Sales and Services Inc – Canada
- Classic, Classic Aircraft Corporation (WACO Classic Aircraft Corporation) – United States
- Classic Fighter, Classic Fighter Industries Inc – United States
- Classic Sport, Classic Sport Aircraft – United States
- Claudius Dornier, Claudius Dornier Seastar GmbH & Co KG – Germany
- Claxton High School – United States
- Clément-Bayard – France
- Clifford Aeroworks, Clifford Aeroworks – United States
- Clutton, Eric Clutton – United Kingdom
- CMASA, Costruzioni Meccaniche Aeronautiche Società Anonima – Italy
- CNA, Compagnia Nazionale Aeronautica – Italy
- CNIAR, Centrul National al Industriei Aeronautice Române – Romania
- CNNA, Companhia Nacional de Navegação Aérea – Brazil
- Coandă, Henri Coandă – Romania, (1910–1911) (Henri Marie Coandă) > Bristol
- COBELAVIA, Compagnie Belge d’Aviation – Belgium
- Cobra, Cobra Aviation – Australia
- Cody, Samuel Cody – United Kingdom, (Samuel Franklin Cody)
- Colemill, Colemill Enterprises Inc – United States
- Collins, Collins Aero – United States
- Colomban, Michel Colomban – France
- Colombia, Columbia Aircraft Company – United States
- Colonial, Colonial Aircraft Corporation – United States
- COMAC, Commercial Aircraft Corporation of China – China (2008–present)
- Commander, Commander Aircraft Company – United States
- Commonwealth (1), Commonwealth Aircraft Corporation Pty Ltd – Australia (CAC)
- Commonwealth (2), Commonwealth Aircraft Corporation Inc – United States, (1942–1947)
- Comper, Comper Aircraft Co. Ltd. – United Kingdom, (1929–?)
- Comte, Comte Aircraft Factory – Switzerland
- Conair, Conair Group Inc. – Canada
- Condor Powered Parachutes, Nicholson, Georgia, United States, (later called Southern Powered Parachutes)
- Conroy, Conroy Aircraft Corporation – United States
- Consolidated Aeronautics Corporation – manufactured Lake aircraft in the 1960s–70s – United States
- Consolidated, Consolidated Aircraft Corporation – United States
- Continental Copters, Continental Copters Inc – United States
- Convair, Consolidated-Vultee Aircraft Corporation – United States, (1943–1996) > General Dynamics
- Convair, Convair Division of General Dynamics Corporation – United States
- Corben Sport Plane and Supply Company (US) – founded 1931, sold to Paul Poberezny in 1952
- Corby, John C. Corby – Australia
- Cosy, Cosy Europe – Germany
- Country Air, Country Air Inc – United States
- Coupe, Coupé-Aviation – France
- Cox-Klemin, Cox-Klemin Aircraft Corporation – United States
- Co-Z, Co-Z Development Corporation – United States
- Co-Z, Co-Z Europa – Germany
- Crae, CRAE Elettromeccanica SpA – Italy
- Craiova, Intreprinderea de Avioane Craiova – Romania
- Cranfield, Cranfield Institute of Technology, College of Aeronautics – United Kingdom
- CRDA, Cantiere Riuniti dell’Adriatico – Italy (1931–?)
- Creative Flight, Creative Flight Inc – Canada
- Croses, Emilien Croses – France
- CSS, Centralne Studium Samolotów – Poland
- CTRM, Composites Technology Research Malaysia Sdn Bhd – Malaysia
- Cub, Cub Aircraft Company – Canada
- Cub Crafters, Cub Crafters Inc – United States
- Culp, Culps Specialties – United States
- Culver, Culver Aircraft Company – United States
- Cunliffe-Owen, Cunliffe-Owen Aircraft – United Kingdom
- Curtiss, Curtiss-Wright Corporation – United States, (1929–present)
- Curtiss Aeroplane and Motor Company, Curtiss Aeroplane and Motor Company – United States, (1909–1929) > Curtiss-Wright
- Curtiss-Reid Aircraft Ltd., Curtiss-Reid Aircraft Ltd. – Canada
- Custer Channel Wing Corporation, Hagerstown, Maryland – United States
- Custom Flight, Custom Flight Components Ltd – Canada
- Custom Flight Limited, Tiny, Ontario, Canada
- Cvjetkovic, Anton Cvjetkovic – United States
- W. Aircraft Ltd – United Kingdom > General Aircraft Ltd
- CWL, Centralne Warsztaty Lotnicze – Poland
- CZAW, Czech Aircraft Works SRO – Czech Republic
- Cyclone Manufacturing Inc., Mississauga, Ontario, Canada (Aerospace Parts Manufacturing)
- CZL, Centralne Zaklady Lotnicze – Poland, (Central Aviation Establishment)
- DAC, Dutch Aeroplane Company VOF – Netherlands
- Damoure-Fabre, Damoure et Fabre – France
- D’Apuzzo, Nicholas E. D’Apuzzo – United States
- DAR, Darjawna Aeroplanna Rabotilniza – Bulgaria, (Dargeavna Aeroplanna Rabotilnitsa – Country Airplane Factory)
- Darracq Motor Engineering Company
- Dart, Dart Aircraft Company – United States
- Dart Aircraft Limited – United Kingdom
- DASA, Daimler-Benz Aerospace AG – Germany, (1989–2000) > EADS
- DASA, Deutsche Aerospace AG – Germany
- DASA-Rockwell, see DASA and ROCKWELL – Germany/United States
- Dassault, Avions Marcel Dassault – France, (1945–1969) > Dassault-Breguet
- Dassault-Breguet, Avions Marcel Dassault-Bréguet Aviation – France, (1969–1990) > Dassault Aviation
- Dassault, Dassault Aviation (1990–present) – France
- Dassault-Breguet/dornier, see DASSAULT-BREGUET and DORNIER – France/Switzerland
- Dätwyler, MDC Max Dätwyler AG – Switzerland
- Davis, Leeon D. Davis – United States
- Dayton-Wright, Dayton-Wright Airplane Co. – United States, (?-1923) > Consolidated Aircraft
- De Havilland, The De Havilland Aircraft Company Ltd – United Kingdom, (1920–1958) (DH) > Hawker Siddeley
- De Havilland Australia, The De Havilland Aircraft Company Pty Ltd – Australia, (DHA) > Boeing
- De Havilland Canada, Bombardier Aerospace De Havilland – Canada, (1928–1989) (DHC) > Bombardier Aerospace
- De Havilland Canada, De Havilland Division of Boeing of Canada Ltd – Canada
- De Havilland Canada, De Havilland Inc – Canada
- De Havilland Canada, The De Havilland Aircraft of Canada Ltd – Canada
- De Schelde, Koninklijke Maatschappij De Schelde – Netherlands
- Deborde-Rolland, Yves Deborde et Jean-Louis Rolland – France
- Delisle, Club Aeronautique Delisle Inc – Canada
- Denel Aerospace Systems, Denel Aerospace Systems, Denel Aviation – South Africa
- Denize, Robert Denize – France
- Denney, Denney Aerocraft Company – United States
- Department of Aircraft Production, Australian government, Australia, (1939–1941) later known as Government Aircraft Factories
- Derazona, PT Derazona Aviation Industry – Indonesia
- Derringer, Derringer Aircraft Company LLC – United States
- Detroit Aircraft Corporation, Detroit Aircraft Corporation – United States, (July 10, 1922 – October 27, 1931)
- Deutsche Airbus, Deutsche Airbus GmbH – Germany
- DFS, Deutsche Forschungsanstalt für Segelflug – Germany, (1925–1945) (Deutsches Forschungsinstitut fur Segelflug – German Research Institute for Sailplane Flight)
- Dewoitine, Constructions Aéronautiques Emile Dewoitine – France
- Dewoitine, Société Aéronautique Française, Avions Dewoitine – France
- DF Helicopters, DF Helicopters SRL – Italy
- DFW, Deutsche Flugzeugwerke – Germany
- DG Flugzeugbau, DG Flugzeugbau GmbH – Germany
- Diamond, Diamond Aircraft Industries GmbH – Austria
- Diamond, Diamond Aircraft Industries Inc – Canada
- Distar Air, Ústí nad Orlicí, Czech Republic
- Dickey, Shirl Dickey Enterprises – United States
- Dijkman-Dulkes, Cor Dijkman-Dulkes – Netherlands
- DINFIA, Dirección Nacional de Investigaciones y Fabricaciones Aeronáuticas – Argentina, (1957–?)
- DKBA FGUP, Federal Unitary State Enterprise, “Dolgoprudniy Design
- Bureau of Automatics” (“DIRIZHABLESTROI USSR ENTERPRISE” in 1932–1940) – key state Russian manufacturer of airships, balloons, aerostats, blimps. – Russian Federation
- Dirgantara, PT Dirgantara Indonesia – Indonesia
- DM Aerospace, DM Aerospace Ltd – United Kingdom
- Doak, Doak Aircraft Company – United States
- DOMA, DOMA INDUSTRIAL LTDA – BRAZIL
- Donnet – France
- Donnet-Denhaut – France
- Dorna, H F Dorna Company – Iran
- Dornier, AG für Dornier-Flugzeuge – Switzerland
- Dornier, Dornier GmbH – Germany, (?-1959) > FUS
- Dornier, Dornier Luftfahrt GmbH – Germany, (?-1989) > DASA
- Dornier, Dornier-Werke GmbH – Germany
- Douglas, Douglas Aircraft Company Inc – United States, (1920–1967) > McDonnell-Douglas
- Downer, Downer Aircraft Industries Inc – United States
- Dragon Fly, Dragon Fly Srl – Italy
- Dream, Dream Aircraft Inc – Canada
- Driggs, Driggs Aircraft Corporation – United States
- Druine, Avions Roger Druine – France
- DSK, DSK Aircraft – United States
- DSK Airmotive, DSK Airmotive – United States
- Dubna, Proizvodstvenno-Tekhnichesky Kompleks Dubnenskogo Mashinostroitelnogo Zavod AO – Russia
- Dudek Paragliding, Bydgoszcz, Poland
- Dufaux, Armand and Henri Dufaux – Switzerland
- Duigan, John Duigan – Australia
- Dumod, Dumod Corp. – United States
- Durand, William H. Durand – United States
- Duruble, Roland Duruble – France
- du Temple, Félix du Temple – France
- Dyke, John W. Dyke – United States
- Dyn’Aéro, Société Dyn’Aéro – France
- Dynamic Sport, Kielce, Poland
- D’Yves Air Pub, La Chapelle-en-Vexin, France
- E.D. Abbott – see Abbott
- E & K, E & K Sp z oo – Poland
- EAA, Experimental Aircraft Association Inc – United States
- EAC, Etudes Aéronautiques & Commerciales SARL – France
- EADS, European Aeronautic Defence and Space Company – France/Germany/Spain, (2000–present) (EADS)
- EADS 3 Sigma (formerly 3 Sigma) – Greece
- Eagle, Eagle Aircraft Company – United States
- Eagle Aircraft, Eagle Aircraft Australia Ltd – Australia
- Eagle Aircraft, Eagle Aircraft International – Australia
- Eagle Aircraft, Eagle Aircraft Pty Ltd – Australia
- Eagles Wing Corporation, Normandy, Tennessee, United States
- Early Bird, Early Bird Aircraft Company – United States
- EasyUp, Medford, Oregon, United States
- EAY – Empresa Aeronáutica Ypiranga – Brazil
- Eberhart, Eberhart – United States
- Eclipse, Eclipse Aviation Corporation – United States
- Ector, Ector Aircraft Company – United States
- Edel Paragliders, Gwangju, South Korea
- Edgar Percival, Edgar Percival Aircraft Ltd. (defunct) – United Kingdom
- Edgley, Edgley Aircraft Ltd – United Kingdom
- EDRA, EDRA Aeronáutica – Brazil
- EDRA, EDRA Helicentro Peças e Manutençao – Brazil
- EEL (Entwicklung und Erprobung von Leichtflugzeugen), Putzbrunn, Germany
- EHI, EH Industries Ltd – United Kingdom/Italy
- Eich, James P. Eich – United States
- EIRI, Eiriavion OY – Finland
- EIS, EIS Aircraft GmbH – Germany
- Ekolot, PPHU Ekolot – Poland
- EFW, Eidgenössische Flugzeugwerke Emmen – Switzerland, (Federal Aircraft Factory)
- ELA Aviación, ELA Aviación SL – Spain
- Elbit, Elbit Systems Ltd – Israel
- Elicotteri Meridionali, Elicotteri Meridionali – Italy, (1967–?)
- Elitar, Ehlitar OOO – Russia
- Ellison-Mahon Aircraft, – US (Seattle, Washington)
- Elmwood, Elmwood Aviation – Canada
- Emair, Emair Inc – United States
- Emair, Emair, Division of Emroth Company – United States
- EMBRAER, Empresa Brasileira de Aeronáutica SA – Brazil
- EMBRAER-FMA, see EMBRAER and FMA – Brazil/Argentina
- Emroth, Emroth Company – United States
- ENAER, Empresa Nacional de Aeronáutica – Chile
- English Electric, English Electric Aviation Ltd – United Kingdom, (?-1959) > British Aircraft Corporation
- English Electric, English Electric Company Ltd – United Kingdom
- Enstrom, R. J. Enstrom Corporation – United States
- Enstrom, The Enstrom Helicopter Corporation – United States
- Epervier, Epervier Aviation SA – Belgium
- Epps, Ben T. Epps – United States
- ERCO, Engineering and Research Corporation – United States
- ERPALS, Erpals Industrie, Etudes et Réalisations de Prototypes pour l’Aviation Légère et Sportive – France
- Esnault-Pelterie, Robert Esnault-Pelterie – France
- Ethiopian Airlines, Ethiopian Airlines Enterprise – Ethiopia
- Ethiopian Airlines, Ethiopian Airlines SC – Ethiopia
- Etrich, Etrich – Austria
- Euler, Euler – Germany
- Eurocopter, Eurocopter Canada Ltd – Canada, (1992–present)
- Eurocopter, Eurocopter GIE – France/Germany
- Eurocopter, Eurocopter SA – France/Germany
- Eurocopter, Eurocopter SAS – France/Germany
- Eurocopter-Kawasaki, see EUROCOPTER and KAWASAKI – France/Germany/Japan
- Euro-Enaer, Euro-Enaer Holding BV – Netherlands
- Eurofighter, Eurofighter Jagdflugzeug GmbH – Germany/UK/Italy/Spain
- Euronef, Euronef SA – Belgium
- Europa, Europa Aviation Ltd – United Kingdom
- Eurospace, Eurospace Costruzioni Srl – Italy
- Evangel, Evangel Aircraft Corporation – United States
- Evans, Evans Aircraft – United States
- Evans, W. Samuel Evans – United States
- Evektor-Aerotechnik, Evektor-Aerotechnik AS – Czech Republic
- Evolution Aircraft, Redmond, Oregon, United States
- EWR, Entwicklungsring-Süd – Germany
- Excalibur, Excalibur Aviation Company – United States
- Exclusive, Exclusive Aviation – United States
- Experimental Aviation, Experimental Aviation Inc – United States
- Explorair, Ebringen, Breisgau-Hochschwarzwald, Baden-Württemberg, Germany
- Explorer (1), Explorer Aviation – United States
- Explorer (2), Explorer Aircraft Inc – United States
- Express, Express Aircraft Company LLC – United States
- Express, Express Design Inc – United States
- Extra, Extra Flugzeugbau GmbH – Germany
- Extra, Extra Flugzeugproduktions- und Vertriebs- GmbH – Germany
- F+W Emmen, Eidgenössisches Flugzeugwerk-Fabrique Fédérale d’Avions-Fabbrica Federale d’Aeroplani – B817
- Fabrica de Avioanes, Fabrica de Avioanes SET – Romania
- Fabrica Militar de Aviones, Fábrica Militar de Aviones – Argentina, (1927–1957) (FMA, or Military Aircraft Factory) > DINFIA > Lockheed Martin Aircraft Argentina SA
- Fairchild (1), Fairchild Aircraft Corporation – United States, (1925–1996) > FairchildDornier
- Fairchild (1), Fairchild Aircraft Inc – United States
- Fairchild (1), Fairchild Aviation Corporation – United States
- Fairchild (1), Fairchild Engine & Airplane Corporation – United States
- Fairchild (1), Fairchild Industries Inc – United States
- Fairchild (1), Fairchild Stratos Corporation – United States
- Fairchild (2), Fairchild Aircraft Ltd. (Canada)
- Fairchild Dornier, Fairchild Aerospace Corporation – United States/Germany, (1996–2002) > Avcraft, M7 Aerospace
- Fairchild Hiller, Fairchild Hiller Corporation – United States
- Fairchild Swearingen, Fairchild Swearingen Corporation – United States
- Fairey, Fairey Aviation Company Ltd – United Kingdom
- Fairtravel, Fairtravel Ltd – United Kingdom
- Fajr, Fajr Aviation & Composites Industry – Iran
- Falconar, Falconar Air Engineering – Canada
- Falconar, Falconar Aircraft Ltd – Canada
- Falconar, Falconar Avia Inc – Canada
- Fanaero-Chile, Fanaero-Chile – Chile
- Farigoux, Georges Farigoux – France
- Farman Aviation Works, Farman Aviation Works – France, (1914–1936) > Ateliers Aéronautiques de Suresnes, SNCAC
- Farrington, Farrington Aircraft Corporation, Paducah, Kentucky, United States
- Fauvel, Fauvel – France
- Ferber, Ferber – France, (1906) > Antoinette
- Feugray, G. Feugray – France
- FFA, FFA Flugzeugwerke Altenrhein AG – Switzerland
- FFA, Flug und Fahrzeugwerke AG – Switzerland
- FFT, Gesellschaft für Flugzeug- und Faserverbund Technologie – Germany
- FFV, Försvarets Fabriksverk – Sweden, (later Förenade Fabriksverken)
- FIAT, Fiat SpA – Italy, (?-1969) > Aeritalia
- Fieseler, Fieseler Flugzeugbau – Germany
- Fieseler, Gerhard Fieseler Werke GmbH – Germany
- Fighter Escort Wings, Fighter Escort Wings – United States
- Fike, William J. Fike – United States
- Finavitec, Patria Finavitec OY – Finland
- Firebird Sky Sports, Bitburg, Germany
- Fisher, Fisher Flying Products Inc – United States
- Fisher Aero, Fisher Aero Corporation – United States
- Flaglor, K. Flaglor – United States
- Flair, Flair Aviation Company – United States
- Fläming Air, Fläming Air GmbH – Germany
- Fleet, Fleet Aircraft Inc – United States, (1928–1929) > Consolidated Aircraft > Fleet Aircraft of Canada
- Fleet, Fleet Aircraft Ltd – Canada, (1930–1957)
- Fleet, Fleet Manufacturing & Aircraft Ltd – Canada
- Fleet, Fleet Manufacturing Ltd – Canada
- Fleetwings, Fleetwings, Inc. – United States
- Fletcher, Fletcher Aviation Company – United States
- Fletcher, Fletcher Aviation Corporation – United States
- Flettner, Flettner – Germany
- Flight Design, Flight Design GmbH – Germany
- Flight Engineers, Flight Engineers Ltd – New Zealand
- Flightworks, Flightworks Corporation – United States
- Flitzer, Flitzer Aero Publishing Company – United States
- FLS, FLS Aerospace (Lovaux) Ltd – United Kingdom
- FLSZ, Flight Level Six-Zero Inc – United States
- Flug und Fahrzeugwerke, Flug und Fahrzeugwerke – Switzerland
- Flug Werk, Flug Werk GmbH – Germany
- Flugzeug Union Süd, Flugzeug-Union Süd GmbH – Germany
- Flyer, Flyer Industria Aeronautica Ltda – Brazil
- Fly Castelluccio Paramotor Paragliding and Trike srl, Ascoli Piceno, Italy
- Flygindustri, AB Flygindustri – Sweden, (1925–1935) (AFI) > Malmö Flygindustri
- Flygkompaniets tygverkstäder Malmslätt (FVM) – Sweden
- Flying Machines s.r.o., Czech Republic.
- FMA, Fábrica Militar de Aviones – Argentina
- FMA, Fábrica Militar de Aviones SA – Argentina
- Focke Achgelis, Focke-Achgelis – Germany
- Focke-Wulf, Focke-Wulf Flugzeugbau AG – Germany
- Focke-Wulf, Focke-Wulf GmbH – Germany
- Fokker, Fokker BV – Netherlands
- Fokker, Fokker-VFW BV – Netherlands
- Fokker, NV Koninklijke Nederlandsche Vliegtuigenfabriek Fokker – Netherlands
- Fokker, NV Koninklijke Nederlandse Vliegtuigenfabriek Fokker – Netherlands
- Folland, Folland – United Kingdom, (1937–1959)
- Ford Motor Company, Ford – United States, (1925–?)
- Fornaire, Fornaire Aircraft Company – United States
- Forney, Forney Aircraft Manufacturing Company – United States
- Foster Wikner, Foster Wikner – United Kingdom
- Fouga, Etablissements Fouga et Cie – France
- Found, Found Aircraft Canada Inc – Canada
- Found, Found Brothers Aviation Ltd – Canada
- Four Winds, Four Winds Aircraft LLC – United States
- Fournier, Avions Fournier SA – France
- Fournier, Bureau d’Etudes Fournier – France
- Fournier, Fournier Aviation – France
- Fournier, René Fournier – France
- Foxcon Aviation, Mackay, Queensland, Australia
- Frakes, Frakes Aviation Inc – United States
- Freebird Airplane Company, Marshville, North Carolina, United States
- Free Bird Innovations, Inc, Detroit Lakes, Minnesota, United States
- FreeX GmbH , Egling, Germany
- Free Spirit, Free Spirit Aircraft Company Inc – United States
- Freedom Master, Freedom Master Corporation – United States
- Freewing, Freewing Aerial Robotics Corporation – United States
- Friedrichshafen, Friedrichshafen, Württemberg, Germany > Dornier (1922)
- Frontier, Frontier Aircraft Inc – United States
- Fry, Fry Aircraft Design – Switzerland
- Fuji, Fuji Heavy Industries Ltd – Japan
- Fuji, Fuji Jukogyo K. K. – Japan
- Funk, Funk Aircraft Company – United States
- FVM, Centrala Verkstader Malmslatt – Sweden
- GAF, Government Aircraft Factories – Australia, (1941–1987) > Aerospace Technologies of Australia
- Gannet, Gannet Aircraft – United States
- Ganzavia, Ganzavia Kft – Hungary
- Gardan, Avions Yves Gardan – France (see Constructions Aéronautiques du Béarn)
- Garland, The Garland Aircraft Company – United Kingdom
- Garland Aerospace, Camden, New South Wales, Australia
- Garrison, Peter Garrison – United States
- Gastambide-Mengin, Gastambide-Mengin – France
- Gatard, Avions A. Gatard – France
- Gatard, Société des Avions Statoplan, A. Gatard – France
- Gates Learjet, Gates Learjet Corporation – United States
- Gavilan, El Gavilán SA – Colombia
- GEFA-FLUG GmbH, GEFA-FLUG GmbH – Germany, (1975–present) (Gesellschaft zur Entwicklung und Förderung Aerostatischer Flugsysteme GmbH – Company for the Development and Promotion of Aerostatic Aerial Systems)
- Gemini Powered Parachutes, Culver, Indiana, United States
- Genair, Genair – South Africa
- General Aircraft, General Aircraft Corporation – United States
- General Aircraft Limited, General Aircraft Ltd – United Kingdom, (1931–1948) (GAL) > Blackburn and General Aircraft
- General Atomics, General Atomics – United States
- General Avia, General Avia Costruzioni Aeronautiche SRL – Italy
- General Aviation Design Bureau of Ukraine – Kiev, Ukraine
- General Dynamics, General Dynamics Corporation – United States
- General Motors, Eastern Aircraft Division of General Motors Corporation – United States
- German Bianco, German Bianco SA, Fabrica Argentina de Aerodinos – Argentina
- Giles, Richard Giles – United States
- Gin Gliders, Yongin, South Korea
- Gippsland, Mahindra Aerospace India – Australia
- Giravia, Giravia – France
- Glaser-Dirks, Glaser-Dirks Flugzeugbau GmbH – Germany
- Glasflügel – Germany
- Glass, Glass Aircraft de Colombia – Colombia
- Glassic, Glassic Composites LLC – United States
- Glendower Aircraft Company, Glendower Aircraft Company – United Kingdom
- Global, Global Helicopter Technology Inc – United States
- Globe, Globe Aircraft Corporation – United States
- Gloster Aircraft Company Ltd – United Kingdom, > Whitworth Gloster Aircraft Ltd. 1961 Hawker Siddeley Group
- Gloucestershire Aircraft, Gloucestershire Aircraft Co. – United Kingdom, > Gloster 1926
- Głowiński, Bronisław Głowiński – Poland
- Goair, Goair Products – Australia
- Golden Circle, Golden Circle Air Inc – United States
- Gomolzig, Herbert Gomolzig Ingenieurbüro – Germany
- Goodrich, Goodrich Corporation – Headquarters North Carolina – United States
- Goodyear, Goodyear Aircraft Corporation – United States
- Gothaer Waggonfabrik, Gothaer Waggonfabrik – Germany, (GWF)
- Gourdou-Leseurre, Gourdou-Leseurre – France
- Government Aircraft Factory, Government Aircraft Factory – Finland
- Gradient sro, Prague, Czech Republic
- Grahame-White, Grahame-White Aviation Co. Ltd. – United Kingdom, (Claude Grahame-White)
- Granville Brothers Aircraft, Granville Brothers Aircraft – United States
- Great Lakes, Great Lakes Aircraft Company Inc – United States
- Great Lakes, Great Lakes Aircraft Corporation – United States
- Great Lakes, Great Lakes Aircraft Inc – United States
- Great Plains, Great Plains Aircraft Supply Company Inc – United States
- Green Sky Adventures, Hawthorne, Florida, United States
- Grega, John W. Grega – United States (see Pietenpol Air Camper)
- Gremont, Gremont – France
- Griffon, Griffon Aerospace Inc – United States
- Grinvalds, Jean Grinvalds – France
- Grob, Burkhart Grob Flugzeugbau GmbH & Co kg – Germany
- Groen, Groen Brothers Aviation Inc – United States
- Grosso, Grosso Aircraft Inc – United States
- Grove, Grove Aircraft Company – United States
- Grover, Grover Aircraft Corporation – United States
- Grumman, Grumman Aircraft Engineering Corporation – United States
- Grumman, Grumman Corporation – United States, (1930–1994)
- Grumman American, Grumman American Aviation Corporation – United States
- Guizhou, Guizhou Aviation Industrial Corporation – China
- Gulfstream Aerospace, Gulfstream Aerospace Corporation – United States, (1978–)
- Hagglund, Hägglund & Söner – Sweden
- HAI, Hellenic Aerospace Industry – Greece
- Hainz, Franz Hainz – Germany
- Halberstadt, Halberstädter Flugzeug-Werke GmbH – Germany
- Hall, Cunningham-Hall Aircraft Corporation – United States
- Halsted, Barry Halsted – United States
- Hamilton, Hamilton Aircraft Company Inc – United States
- Hamilton, Hamilton Aviation – United States
- H&E Paramotores, Madrid, Spain
- Handley Page, Handley Page (Reading) Ltd – United Kingdom
- Handley Page, Handley Page Ltd – United Kingdom, (?-1970) > Scottish Aviation
- Hannaford, Hannaford Aircraft – United States
- Hannover, Hannoversche Waggonfabrik AG – Germany
- Hanriot, Aeroplanes Hanriot et Cie – France, (1914–1936) > SNCAC
- Hansa-Brandenburg, Hansa-Brandenburg – Germany, > Heinkel
- Hanseatische Flugzeugwerke, Hanseatische Flugzeugwerke – Germany, (Hansa)
- HAPI, HAPI Engines Inc – United States
- Harbin, Harbin Aircraft Manufacturing Corporation – China, (1952–?) (HAMC)
- Harbin EMBRAER, Harbin Embraer Aircraft Industry Company Ltd – China
- Harlow, Harlow Aircraft Co. – United States
- Harmening’s High Flyers, Genoa, Illinois and later in Big Stone City, South Dakota, United States
- Harmon (1), James B. Harmon – United States
- Harmon (2), D & J Harmon Co Inc – United States
- Harmon (2), Harmon Rocket LLC – United States
- Harper Aircraft Manufacturing Company, Harper Aircraft Manufacturing Company Inc. – United States
- Harris & Sheldon, Harris & Sheldon Ltd – United Kingdom
- HAT, Hellenic Aeronautical Technologies – Greece
- Hatz, John D. Hatz – United States
- Havelsan, Hava Elektronik Sanayi (Air Electronic Industries) – Turkey
- Hawker, Hawker Aircraft Ltd – United Kingdom, (1920–1961) > Hawker Siddeley
- Hawker De Havilland, Hawker De Havilland Australia Pty Ltd – Australia
- Hawker De Havilland, Hawker De Havilland Ltd – Australia
- Hawker Pacific Aerospace, Hawker Pacific Aerospace – United Kingdom, (1980–present)
- Hawker Siddeley, Hawker Siddeley Aviation Ltd – United Kingdom
- Hawksley, A W Hawksley Ltd. – United Kingdom
- HB-Aircraft, HB-Aircraft Industries Luftfahrzeug AG – Austria
- HB-Flugtechnik, HB-Flugtechnik GmbH – Austria
- HBN, HBN Group – United Kingdom/France, (Hawker, Breguet and Nord-Aviation)
- Heinkel, Ernst Heinkel AG – Germany, (?-1959) > FUS
- Heintz, Christophe Heintz – France
- Helibras, Helicópteros do Brasil SA – Brazil
- Helikopter Services, Helikopter Services – Unknown
- Helio, Helio Aircraft Company – United States
- Helio, Helio Aircraft Corporation – United States
- Helio, Helio Aircraft Ltd – United States
- Heliopolis, Heliopolis Air Works – Egypt
- Helipro, Helipro Corporation International – United States
- Heli-Sport, CH-7 Heli-Sport Srl., Torino, Italy
- Helwan, Helwan Air Works – Egypt
- Henderson, Henderson Aero Specialties Inc – United States
- Henschel, Henschel & Son – Germany
- HESA, IRan Aircraft Industries – Iran
- Heston Aircraft, Heston Aircraft Co. Ltd. – United Kingdom
- HFB, Hamburger Flugzeugbau GmbH – Germany, (?-1940) > Blohm + Voss
- Highlander, Highlander Aircraft Corporation – United States
- Hillberg Helicopters, Fountain Valley, California, United States
- Hiller, Hiller Aircraft Company Inc – United States
- Hiller, Hiller Aircraft Corporation – United States
- Hiller, Hiller Aviation Inc – United States
- Hiller, Hiller Helicopters – United States
- Hiller, Hiller Helicopters Inc – United States
- Hindustan Aeronautics Limited, Bangalore, India
- Hindustan, Hindustan Aircraft Ltd – India
- Hiro Naval Arsenal, Hiro Naval Arsenal – Japan
- Hirth, Wolf Hirth GmbH – Germany
- Hispano, La Hispano Aviación S.A. – Spain, (?-1972) > CASA
- Hispano-Suiza, Hispano-Suiza – France
- Historical Aircraft, Historical Aircraft Corporation – United States
- HK, HK Aircraft Technology AG – Germany
- HOAC, HOAC Austria Flugzeugwerk Wiener Neustadt GmbH – Austria
- Hoffmann, Hoffmann Aircraft Flugzeugproduktion und Entwicklung GmbH – Austria
- Hoffmann, Hoffmann Flugzeugbau-Friesach GmbH – Austria
- Hoffmann, Wolf Hoffmann Flugzeugbau KG – Germany
- Holcomb, Jerry Holcomb – United States
- Hollmann, Martin Hollmann – United States
- Honda Aircraft Company, subsidiary of Honda Motor Company Ltd – Japan
- Honda-Mississippi, Honda & Mississippi State University – Japan/United States
- Hongdu, Hongdu Aviation Industry Group – China
- Hovey, Robert W. Hovey – United States
- Howard (1), Howard Aircraft Corporation – United States
- Howard (2), Howard Aero Inc – United States
- Howard (2), Howard Aero Manufacturing Division of Business Aircraft Corporation – United States
- Howard Hughes Engineering, Howard Hughes Engineering Pty Ltd – Australia
- HPA, High Performance Aircraft GmbH & Co KG – Germany
- Huff-Daland, Huff-Daland – United States, (1920–1933) (Ogdensburg Aeroway Corp.) > Huff-Daland Aero Corporation > Huff-Daland Aero Company > Keystone Aircraft Corporation
- Hughes, Hughes Helicopters Division of Summa Corporation – United States
- Hughes, Hughes Helicopters Inc – United States
- Hughes, Hughes Tool Company, Aircraft Division – United States
- Humbert Aviation, Ramonchamp, France
- Hummel Aviation, J. Morry Hummel, Bryan, Ohio, United States
- Hunting, Hunting Aircraft Ltd – United Kingdom, (1957–1959) > British Aircraft Corporation
- Hunting Percival, Hunting Percival Aircraft Ltd – United Kingdom
- Hurel-Dubois, Société de Construction des Avions Hurel-Dubois – France
- Hybrid Aircraft Corporation – United States
- Hydroplane, Gidroplan ooo – Russia
- Hydroplane, Hydroplane Ltd – Russia
- Hynes, Hynes Helicopter Inc – United States
- Hyundai, Hyundai Precision Industry – South Korea, > Korea Aerospace Industries
- IAI, Israel Aerospace Industries Ltd – Israel
- Iannotta, Dott. Ing. Orlando Iannotta – Italy
- IAR, IAR (Industria Aeronautică Română) SA – Romania
- Iberavia, Spain
- IBIS, Ibis Aerospace Ltd – Czech Republic/Taiwan
- Ibis Aircraft, Ibis Aircraft S.A., Cali, Colombia
- ICA, Intreprinderea de Constructii Aeronautice – Romania
- ID Integration, ID Integration, Inc. – United States
- III, Iniziative Industriali Italiane SpA – Italy
- Ikar, OOO Aviaklub Ikar – Ukraine
- Ikarus, Ikarus Tvornica Aero i Hydroplana – Serbia and Montenegro
- Ilyushin, Aviatsionnyi Kompleks Imeni S. V. Ilyushina OAO – Russia
- Ilyushin, Ilyushin OKB – Russia
- Ilyushin – see Aviation Association Ilyushin
- IMAM, Industrie Meccaniche e Aeronautiche Meridionali – Italy
- IMCO, Intermountain Manufacturing Company – United States, (1962–1966) > Rockwell
- IMP, IMP Group Ltd – Canada
- Impulse, Impulse Aircraft GmbH – Germany
- Indaer Chile, Industria Aeronáutica de Chile – Chile
- Indaer Peru, Industria Aeronautica del Peru SA – Peru
- Independence Paragliding, (A brand of Fly-market Flugsport-Zubehör GmbH & Co. KG) Eisenberg, Germany
- IAe’, Bandung – Indonesia
- Indus, IndUS Aviation Inc – United States
- Indy Aircraft Limited, Independence, Iowa, United States
- Industrias Aeronauticas y Mecanicas, Industria Aeronáutica y Mecánica del Estado (IAME) – Argentina, (1953–1957) (Aeronautical and Mechanical Industries of the State) > DINFIA
- Infinity Power Chutes, Sturgis, Michigan, United States
- Innovation, Innovation Engineering Inc – United States
- Instituo Aerotecnico, Instituto Aerotécnica (Fabrica Militar de Aviones) – Argentina, (1943–1957) (IA) > DINFIA
- Instytut Lotnictwa, Instytut Lotnictwa – Poland
- Inter-Air, International Aircraft Manufacturing Inc – United States, (?-1967) > Bellanca
- Interavia, Interavia Konstruktorskoye Buro AO – Russia
- Interceptor Corporation, Interceptor Corporation – United States
- International Helicopters, International Helicopters Inc – United States
- InterPlane Aircraft, Zbraslavice, Czech Republic
- Interstate Engineering Corporation|Interstate, Interstate Engineering Corporation – United States
- Intracom, Intracom General Machinery SA – Switzerland
- IPAI, IPAI, Escola de Engenharia de Sâo Carlos – Brazil
- IPT, Instituto de Pesquisas Tecnologicas – Brazil
- IPTN, PT. Industri Pesawat Terbang Nusantara – Indonesia
- IRGC, Institute of Industrial Research and Development of the Iran Revolutionary Guard Corps – Iran
- IRIAF, Islamic Republic of Iran Air Force – Iran
- Irkut, Irkutskoye Aviatsionnoye Proizvodstvennoye Obedinenie OAO – Russia
- IRMA, Intreprinderea de Reparat Material Aeronautic – Romania
- Isaacs, John O. Isaacs – United Kingdom
- ISAE, Integrated Systems Aero Engineering Inc – United States
- Island Aircraft, Island Aircraft Ltd – United Kingdom
- Israviation, Israviation Ltd – Israel
- Issoire, Issoire Aviation SA – France
- ITV Parapentes, Épagny, Haute-Savoie, France
- Ivanov Aero, Hradec Králové, Czech Republic
- J & AS, J & AS Aero Design Sp z oo – Poland
- Jabiru, Jabiru Aircraft Pty Ltd – Australia
- Jackaroo, Jackaroo Aircraft Ltd – United Kingdom
- Jag Helicopter, JAG Helicopter Group LLC – United States
- James, James Aviation – New Zealand
- Janowski, Jaroslaw Janowski – Poland
- Javelin, Javelin Aircraft Company Inc – United States
- JDM – see Avions JDM
- Jeffair, Jeffair Corporation – United States
- Jeof srl, Candiana, Italy
- Jetcrafters, Jetcrafters Inc – United States
- Jet Pocket, Chantelle, Allier, France
- Jetprop, Jetprop LLC – United States
- JetstarJetstar, Inc Australia
- Jetstream, Jetstream Aircraft Ltd – United Kingdom
- Jingmen Aviation, Jingmen, China
- Jodel, Avions Jodel SA – France
- Jodel, Société des Avions Jodel – France
- Johnson, Johnson Aircraft Inc – United States
- Johnson, Johnston Aircraft Service – United States
- Jojo Wings, Roudnice nad Labem, Czech Republic
- Jordan Aerospace, Jordan Aerospace Industries – Jordan
- Jovair – United States
- Junkers, Junkers Flugzeug- und Motorenwerke AG – Germany
- Junqua, Roger Junqua – France
- Jurca, Marcel Jurca – France
- Just Aircraft, Walhalla, South Carolina, United States
- K & S, K & S Aircraft – Canada
- K & S, K & S Aircraft Supply – Canada
- Kader, Kader Aircraft Factory – Egypt
- Kaiser,Kaiser Flugzeugbau GmbH – Germany
- Laurent de Kalbermatten, Villars-sur-Glâne, Switzerland
- Kalinauskas, Rolandas Kalinauskas – Lithuania
- Kaman, Kaman Aerospace Corporation – United States
- Kaman, Kaman Aircraft Corporation – United States
- Kaman, Kaman Corporation – United States
- Kaminskas, Rim Kaminskas – United States
- Kamov, Kamov OAO – Russia
- Kamov, Kamov OKB – Russia
- Kamov, Vertoletyi Nauchno-Tekhnicheskiy Kompleks Imeni N. I. Kamova – Russia
- Kanpur, Indian Air Force, Aircraft Manufacturing Depot – India
- KARI, Korea Aerospace Research Institute – South Korea
- Kari-Keen, Kari-Keen Aircraft Inc – United States
- Kawanishi Aircraft Company, Kawanishi Aircraft Company – Japan
- Kawasaki, Kawasaki Heavy Industries Ltd – Japan
- Kawasaki, Kawasaki Jukogyo KK – Japan
- Kawasaki, Kawasaki Kokuki Kogyo K. K. – Japan
- Kayaba, Kayaba Industrial Co. – Japan
- Kazan, Kazansky Vertoletnyi Zavod AO – Russia
- KEA, Kratiko Ergostasio Aeroplanon – Greece (1925–present)
- Keleher, James J. Keleher – United States
- Kelly, Dudley R. Kelly – United States
- Kelowna, Kelowna Flightcraft Group – Canada
- Kestrel (1), Kestrel Aircraft Company – United States
- Kestrel (2), Kestrel Sport Aviation – Canada
- Keuthan, Keuthan Aircraft – United States, (?-1996) > Aero Adventure Aviation
- Keystone Aircraft Corporation, Keystone Aircraft Corporation – United States, (1920–1933) (Ogdensburg Aeroway Corp.) > Keystone-Loening > Curtiss-Wright
- Khrunichev, Gosudarstvennyi Kosmicheskii Nauchno-Proizvodstvennyi Tsentr Imeni M V Khrunicheva – Russia
- Kieger, André Kieger – France
- Killingsworth, Richard Killingsworth – United States
- Kimball, Jim Kimball Enterprises Inc – United States
- Kimball, Michael G. Kimbrel – United States
- Kimfly D.O.O., Vodice, Slovenia
- Kinetic, Kinetic Aviation Inc – United States
- King’s, The King’s Engineering Fellowship – United States
- Kjeller, Kjeller Flyvemaskinsfabrik – Norway
- Klemm, Hans Klemm Flugzeugbau – Germany, > Siebel
- Klemm, Klemm Leichtflugzeugbau GmbH – Germany
- Klemm, Klemm-Flugzeuge GmbH – Germany
- KLS Composites, KLS Composites – United States
- Kokusai, Kokusai – Japan
- Kolb, Kolb Aircraft Inc – United States
- Kolb, Kolb Company Inc – United States
- Kolb, The New Kolb Aircraft Company Inc – United States
- Kondor, Kondor – Germany
- Koolhoven, Koolhoven Aircraft – Netherlands
- Korea Aerospace, Korea Aerospace Industries Ltd – South Korea, (KAI)
- Korean Air, Korean Air Lines Company Ltd – South Korea
- Kovach-Elmendorf, Alexander Kovach and Leonard Elmendorf – United States
- Kovacs, Joseph Kovács – Brazil
- Kraft, Phil Kraft – United States
- Krasniye Kryl’ya – Taganrog, Russia
- Kress, Wilhelm Kress – Austria-Hungary
- Kreider-Reisner, Kreider-Reisner Aircraft Company Inc – United States
- Kyūshū Aircraft Company, Kyūshū Aircraft Company – Japan
- Liaoning Ruixiang General Aviation Manufacture Company Limited, Shenyang, China
- La France, Neil La France – United States
- Laird, E. M. Laird Airplane Company – United States
- Lake, A.E.R.O. Aircraft Services, LLC [1] – United States
- Lake, Lake Aircraft Corporation – United States
- Lake, Lake Aircraft Division of Consolidated Aeronautics Inc. – United States
- Lake, Lake Aircraft Inc. – United States
- Lake, Lake Amphibian Inc. – United States
- Lambert, Lambert Aircraft Engineering bvba – Belgium
- Lammer Geyer, Lammer Geyer Aviation – South Africa
- Lancair, Lancair Group Inc – United States
- Lancair, Lancair International Inc – United States
- Lancashire, Lancashire Aircraft Company Ltd – United Kingdom
- Larkin Aircraft, Larkin Aircraft Supply Co. – Australia, (LASCO)
- Laser, Laser Aerobatics – Australia
- Latécoère, Société Industrielle d’Aviation Latécoère – France
- Laven, Joe Laven – United States
- Laverda, Laverda SpA – Italy
- LAVIASA, Latinoamericana de Aviación S.A. – Argentina
- Lavochkin, Lavochkin (OKB-301) – Russia
- Layzell Gyroplanes – Quedgeley, Gloucester, UK
- Leading Edge Air Foils, Lyons, Wisconsin, United States
- Lear, Lear Inc – United States
- Learjet, Bombardier Aerospace Learjet – United States
- Learjet, Learjet Corporation – United States, (?-1990) > Bombardier Aerospace
- Learjet, Learjet Industries Inc – United States
- Learjet, Learjet Corporation – United States
- Learjet, Learjet Inc – United States
- Leavens, Leavens Brothers Ltd – Canada
- Lederlin, François Lederlin – France
- Legend, Legend Aircraft Inc – United States
- Leger Aviation, Archiac, France
- Leger, Gilles Leger – Canada
- LeO, Lioré et Olivier – France
- Les Mureaux – see ANF Mureaux
- Let, Let Národní Podnik – Czechoslovakia
- Let, Let AS – Czech Republic
- Letov, Letov – Czechoslovakia
- Levasseur, Pierre Levasseur – France
- Levy, Constructions Aeronautiques J. Levy – France
- Leza AirCam Corporation — see Lockwood Aircraft
- Leza-Lockwood — see Lockwood Aircraft
- Liberty (1), Liberty Aeronautical – United States
- Liberty (2), Liberty Aerospace Inc – United States
- Lichtwerk, NV Lichtwerk – Netherlands
- Light Aero, Light Aero Inc – United States
- Light Miniature Aircraft, Okeechobee, Florida, United States
- Light Wing, Light Wing AG – Switzerland
- Lightning Bug, Lightning Bug Aircraft Corporation – United States
- Lilienthal, Otto Lilienthal – Germany
- Linke-Hofmann, Linke-Hofmann Werke A. G. – Germany
- Lipnur, Lembaga Industri Penerbangan Nurtanio – Indonesia
- Lisunov, Lisunov OKB – Russia
- Liteflite, Botany, New South Wales, Australia
- LiteWing Aircraft, Caryville, Tennessee, United States
- Little Wing Autogyros, Inc., Mayflower, Arkansas, United States
- Lmaasa, Lockheed Martin Aircraft Argentina SA – Argentina
- Load Ranger, Load Ranger Inc – United States
- Lockheed Corporation – United States, (1912–1996) > Lockheed Martin
- Lockheed Martin, Lockheed Martin Corporation – United States, (1996–present)
- Lockheed Martin-Boeing, see Lockheed Martin and Boeing – United States
- Lockheed-Azcarate, Lockheed-Azcarate SA – Mexico, (LASA)
- Lockheed-Boeing, see Lockheed and Boeing – United States
- Lockheed-Kaiser, Avions Lockheed-Kaiser – Argentina
- Lockwood Aircraft Corporation — United States
- Loehle, Loehle Aircraft Corporation – United States
- Loening Aeronautical, Loening Aircraft Co. Inc. – United States, (Loening Aeronautical Engineering Corp. or Grover Loening Aircraft Co. Inc.)
- Lohner, Jacob Lohner Werke und Sohn – Austria-Hungary
- Loire, Loire – France
- Lombardi, Aeronautica Lombardi – Italy
- Lombardi, Francis Lombardi & Companie – Italy
- Long, David Long – United States
- Longren, Longren Aircraft Company Inc – United States
- Lopresti, LoPresti Inc – United States
- Loravia, Lorraine Aviation – France
- Lowe, Willard & Fowler Engineering Company
- Letecké Opravovne Trencin SP|LOT, Letecké Opravovne Trencin SP – Slovakia
- Loving-Wayne, Neal V. Loving, Wayne Aircraft Company – United States
- LTV, Ling-Temco-Vought Inc – United States
- LTV, LTV Aerospace Corporation – United States
- Lualdi-Tassotti, Lualdi-Tassotti – Italy
- Lucas, Emile Lucas – France
- Luftfahrzeug-Gesellschaft m.b.H. (LFG), Germany, airships 1909–1932, aeroplanes 1915–1933
- Luftschiffbau Schütte-Lanz, Germany, rigid airships 1909–1917, aeroplanes 1915–1918
- Luftverkehrsgesellschaft m.b.H., Berlin-Johannisthal – Germany
- Lunds Tekniske, Lunds Tekniske – Norway
- Lundy, Brian Lundy – United States
- Luscombe, Luscombe Aircraft Corporation – United States
- Luscombe, Luscombe Airplane Corporation – United States
- Luscombe, Luscombe Airplane Development Corporation – United States
- Luton, Luton Aircraft Ltd – United Kingdom
- LWD, Lotnicze Warsztaty Doświadczalne – Poland, (Experimental Aviation Workshops)
- LWS, Lubelska Wytwórnia Samolotów – Poland, (Lublin Aircraft Factory)
- Lyavin, Peter Lyavin – Russia
- M&D Flugzeugbau, Germany
- M7 Aerospace, M7 Aerospace – United States, (2002–present)
- Macair, Macair Industries Inc – Canada
- Macchi, Aeronautica Macchi SpA – Italy, > Aermacchi
- Macdonald, MacDonald Aircraft Company – United States
- Machen, Machen Inc – United States
- Mac Para Technology, Rožnov pod Radhoštěm, Czech Republic
- Mad Max Aero, Mad Max Aero – United States
- Magni, Magni Gyro di Vittorio Magni – Italy
- Makelan, Makelan Corporation – United States
- Malmo, AB Malmö Flygindustri – Sweden
- MAPO, Federalnoye Gosudarstvennoye Unitarnoye Predpriyatie, Voyenno-Promyshlennyi Kompleks MAPO – Russia
- Maranda, Maranda Aircraft Company Ltd – Canada
- Marbella Parapente, Málaga, Spain
- March, Jones And Cribb, March, Jones & Cribb Ltd. – United Kingdom
- Marco, Marco-Elektronik Company – Poland
- Marganski, Edward Marganski-Zaklad Remontów i Produkcji Sprzetu Lotniczego – Poland
- Marie, Jean-Pierre Marie – France
- Marmande, Marmande Aéronautique – France
- Marquart, Ed Marquart – United States
- Marsh, Marsh Aviation Company – United States
- Marshall of Cambridge Aerospace – United Kingdom
- Marshall & Sons, Marshall & Sons – United Kingdom
- Marske Aircraft Corporation, Marion, Ohio, United States
- Martin, Glenn L. Martin Company – United States, (1912–1916, 1917–1961, ?-1996) > Lockheed Martin
- Martin-Baker, Martin-Baker Aircraft Company – United Kingdom
- Martinsyde, Martinsyde Ltd. – United Kingdom
- Maule, Maule Air Inc – United States
- Maule, Maule Aircraft Corporation – United States
- Maupin, Jim Maupin – United States
- Maverick, Maverick Air Inc – United States
- Maverick, Maverick Jets Inc – United States
- Max Holste, Société des Avions Max Holste – France
- Max Holste, Société Nouvelle Max Holste – France
- MBB, MBB Helicopter Canada Ltd – Canada, > Eurocopter Canada
- MBB, Messerschmitt-Bölkow-Blohm GmbH – Germany, (1969–1989) > DASA
- MBB-Kawasaki, see MBB and KAWASAKI – Germany/Japan
- Mccarley, Charles E. McCarley – United States
- MCC Aviation, Gandvaux, Switzerland
- McCulloch – United States
- Mcdonnell, McDonnell Aircraft Corporation – United States, (1938–1967) > McDonnell-Douglas
- Mcdonnell, McDonnell Company – United States
- Mcdonnell Douglas, McDonnell Douglas Corporation – United States, (1967–1997) > Boeing
- Mckinnon, McKinnon Enterprises Inc – United States
- Mckinnon, McKinnon-Viking Enterprises – Canada
- MD Helicopters, MD Helicopters Inc – United States
- MDB, MDB Flugtechnik AG – Switzerland
- Mead, George Mead – United States
- Melbourne, Melbourne Aircraft Corporation Pty Ltd – Australia
- Melex, Melex USA Inc – United States
- Menschinsky, Menschinsky – Russia
- Merckle, Merckle – Germany
- Mercury, Mercury Air Group – United States
- Meridionali, Elicotteri Meridionali SpA – Italy
- Merlin, Merlin Aircraft Inc – United States
- “”Merrill Aviation & Defense””, United States
- “”Merrill Aviation & Defense Ranger Division””, United States
- Messerschmitt, Messerschmitt AG – Germany, (1938–1959) > FUS
- Messerschmitt-Bolkow, Messerschmitt-Bölkow GmbH – Germany, (1968–1969) > MBB
- Meteor, Meteor SpA, Costruzione Aeronautiche – Italy
- Metropolitan-Vickers, (Metrovick) – United Kingdom
- Mexican Agricultural Aeronautics – see AAMSA
- Meyer, George W. Meyer – United States
- Meyers, Meyers Aircraft Company – United States
- Micco, Micco Aircraft Company – United States
- Micro Craft, Micro Craft Inc. – United States
- Microjet, Microjet SA – France
- Microleve, Microleve – Brazil
- Microturbo, Microturbo SA – France
- Mid-Continent, Mid-Continent Aircraft Corporation – United States
- Midwest Aerosport, Midwest Aerosport Inc – United States
- Midwest Engineering & Design, Overland Park, Kansas, United States
- Mignet, Henri Mignet – France
- Mikoyan, Aviatsionnyi Nauchno-Promyshlennyi Kompleks MiG – Russia
- Mikoyan, Aviatsionnyi Nauchno-Promyshlennyi Kompleks-ANPK MiG Imeni A. I. Mikoyana – Russia
- Mikoyan, Mikoyan OKB – Russia
- Mikoyan, Moskovskii Mashinostroitelnyy Zavod Imeni A. I. Mikoyana – Russia
- MIL, Mil OKB – Russia
- MIL, Moskovsky Vertoletny Zavod Imeni M L Milya OAO – Russia
- Miles, F. G. and G. H. Miles – United Kingdom
- Miles, F. G. Miles Ltd – United Kingdom
- Miles, Miles Aircraft Ltd – United Kingdom
- Miller (1), Miller – United States
- Miller (2), William Y. Miller – United States
- Miller, Merle Miller – United States
- Millicer, Millicer Aircraft Industries Pty Ltd – Australia
- Mini-Fly GmbH, Kirchardt, Germany
- Mini-IMP, Mini-IMP Aircraft Company – United States
- Minty, Ted Minty – Australia
- Mirage, Mirage Aircraft Inc – United States
- Mitchell Aircraft Corporation, Mitchell Aircraft Corporation – United States
- Mitchell-Procter, Mitchell-Procter Aircraft Ltd – United Kingdom
- Mitsubishi, Mitsubishi Aircraft International Inc – United States, (see Mitsubishi Zero)
- Mitsubishi, Mitsubishi Heavy Industries Ltd – Japan
- Mitsubishi, Mitsubishi Jukogyo KK – Japan
- Mitsubishi, Shin Mitsubishi Jukogyo KK – Japan
- Molniya, Nauchno-Proizvodstvennoye Obedinenie Molniya OAO – Russia
- Mong, Ralph Mong – United States
- Moniot, Avions Philippe Moniot – France
- Monnett, John T. Monnett – United States
- Monocoupe Aircraft of Florida, Monocoupe Aircraft of Florida Inc – United States
- Monocoupe, Monocoupe Aircraft Corporation – United States
- Montagne, Montagne Aircraft LLC – United States
- Montana, Montana Coyote Inc – United States
- Moog, Moog Incorporated – United States
- Mooney, Al W. Mooney – United States
- Mooney, Mooney Aircraft Corporation – United States
- Mooney, Mooney Aircraft Inc – United States
- Morane-Saulnier, Gérance des Etablissements Morane-Saulnier – France
- Morane-Saulnier, Société Anonyme des Aéroplanes Morane-Saulnier – France
- Morane-Saulnier, Société d’Exploitation des Etablissements Morane-Saulnier – France
- Morane-Saulnier, Société Morane-Saulnier – France
- Moravan, Moravan AS – Czech Republic
- Moravan, Moravan Národní Podnik – Czechoslovakia
- Morrisey, Bill Morrisey – United States
- Morrisey, Morrisey Aircraft Corporation – United States
- Morrisey, Morrisey Aviation Inc – United States
- Morrisey, The Morrisey Company – United States
- Morse, George Morse Jr – United States
- Moss Brothers Aircraft – United Kingdom
- Moth Aircraft, Moth Aircraft Corporation – United States
- Moyes Delta Gliders, Botany, New South Wales, Australia
- Moyes Microlights, Botany, New South Wales, Australia
- MPB AEROSPACE S.L., MPB Aerospace S.L. – Spain
- Moura, Mauricio Impelizieri P. Moura – Brazil
- Mraz, Tovarna Letadel Inz. J. Mráz – Czech Republic
- MS Parafly, Meßstetten, Germany
- MSW, MSW Aviation – Switzerland
- Mudry, Avions Mudry & Cie – France
- Mureaux – see ANF Les Mureaux
- Murphy, Murphy Aircraft Manufacturing Ltd – Canada
- Murphy, Murphy Aviation Ltd – Canada
- Murrayair, Murrayair Ltd – United States
- Mustang, Mustang Aeronautics Inc – United States
- Mven, Mven OOO – Russia
- Myasishchev, Eksperimentalnyi Mashinostroitelnyi Zavod Imeni V M Myasishcheva – Russia
- Myasishchev, Myasishchev OKB – Russia
- Mylius, Leichtflugzeuge-Entwicklungen Dipl. Ing. Hermann Mylius – Germany
- Mylius, Mylius Flugzeugwerk GmbH & Co KG – Germany
- Naglo, Naglo Boots-Werft – Germany
- NAGL System, Weißkirchen in Steiermark, Austria
- NAI, Nanjing Aeronautical Institute – China
- Nakajima, Nakajima Aircraft Company – Japan
- National Aerospace Laboratories, National Aeronautical Laboratory – India
- NAMC (1), Nihon Aeroplane Manufacturing Company Ltd – Japan
- NAMC (1), Nihon Kokuki Seizo KK – Japan
- Nanchang, Nanchang Aircraft Manufacturing Company – China
- Nanjing, Nanjing Light Aircraft Company – China
- Nanjing University, Nanjing University of Aeronautics and Astronautics – China
- Nardi, Nardi Costruzioni Aeronautiche SpA – Italy
- Nash, Nash Aircraft Ltd – United Kingdom
- National Aeronautics, National Aeronautics Company – United States
- National Aircraft Factory No. 2 Stockport United Kingdom
- National Steel, National Steel Corporation Ltd – Canada
- Naval Aircraft Factory, Naval Aircraft Factory – United States
- Naval Air Establishment, Naval Air Establishment – China
- Nervures, Soulom, France
- NIMBUS Srl, NIMBUS Srl – Italy
- Navion, Navion Aircraft Company – United States
- Navion, Navion Aircraft Corporation – United States
- Navion, Navion Rangemaster Aircraft Corporation – United States
- NDN, NDN Aircraft Ltd – United Kingdom
- Neico, Neico Aviation Inc – United States
- NEIVA, Industria Aeronáutica Neiva SA – Brazil
- NEIVA, Sociedade Construtora Aeronáutica Neiva Ltda – Brazil
- Nesmith, Robert E. Nesmith – United States
- Netherland Army Aircraft Factory, Netherland Army Aircraft Factory – Netherlands
- NeuraJet, Senftenbach, Austria
- New Glasair, New Glasair LLC – United States
- New Glasair, New GlaStar LLC – United States
- New Meyers, The New Meyers Aircraft Company – United States
- New PowerChutes, Alberton, Gauteng, South Africa
- New Standard, New Standard Aircraft Company – United States
- New Zealand, New Zealand Aerospace Industries Ltd – New Zealand
- NHI, NH Industries SARL – France/Germany/Italy
- Nicollier, Henri Nicollier – France
- Nieuport, Societe Anonyme des Etablissements Nieuport – France > Nieuport-Astra
- Nieuport-Astra – France > Nieuport-Delage
- Nieuport-Delage – France > Loire-Nieuport
- Nieuport-Macchi – Italy > Macchi
- Nieuport & General/British Nieuport (1916–1920) – United Kingdom
- Nipper, Nipper Aircraft Ltd – United Kingdom
- Nipper, Nipper Kits and Components Ltd – United Kingdom
- Nitsche, LTB Gerhard Nitsche – Germany
- Nitsche, Nitsche Flugzeugbau GmbH – Germany
- Noin, Noin Aéronautique – France
- Noorduyn, Noorduyn Aviation Ltd – Canada
- Noorduyn, Noorduyn Norseman Aircraft Ltd – Canada
- Nord, Nord-Aviation, Société Nationale de Constructions Aéronautiques – France, (?-1970) > Aérospatiale
- Nord, Société Nationale de Constructions Aéronautiques du Nord – France
- Nordic Aircraft AS, Kinsarvik, Norway
- Nordflug, Flugzeugbau Nord GmbH – Germany
- Norman, Norman Aviation – Canada
- Normand Dube, Aviation Normand Dubé Inc – Canada
- North American, North American Aviation Inc – United States, (1928–1966) > Rockwell
- North American Rockwell, North American Rockwell Corporation – United States
- North American Rotorwerks, Tukwila, Washington, United States
- Northern, Northern Aircraft Inc – United States, (?-1959) > Downer
- Northrop, Northrop Aircraft Inc – United States, (1926–1994)
- Northrop, Northrop Corporation – United States
- Northrop Grumman, Northrop Grumman Corporation – United States, (1994–present)
- Nostalgair, Nostalgair Inc – United States
- NST-Machinenbau, Werther, North Rhine-Westphalia, Germany
- Nuri Demirag, Nuri Demirag – Turkey
- Nusantara, PT Industri Pesawat Terbang Nusantara – Indonesia
- Nuventure, NuVenture Aircraft – United States
- Nuwaco, NuWaco Aircraft Company Inc – United States
- NZAI, New Zealand Aerospace Industries – New Zealand
- Oakland, Oakland Airmotive Company – United States
- Oberlerchner, Josef Oberlerchner Holzindustrie – Austria
- Offpiste Limited, Dursley, Gloucestershire, United Kingdom
- OGMA, Indústria Aeronáutica de Portugal – Portugal
- Oldfield, Andrew Oldfield – United States
- Oldfield, Barney Oldfield Aircraft Company – United States
- Olympic Ultralights, Olympic Ultralights LLC – United States
- OMAC, OMAC Inc – United States
- OMF, Ostmecklenburgische Flugzeugbau GmbH – Germany
- OneAircraft, Celje, Slovenia
- One Aviation – Albuquerque, New Mexico, United States
- Omni, Omni Titan Corporation – United States
- Omni-Weld, Omni-Weld Inc – United States
- On Mark, On Mark Engineering Company – United States
- O’neill, O’Neill Airplane Company – United States
- Optica, Optica Industries Ltd – United Kingdom
- Option Air, Option Air Reno – United States
- Orel Aircraft, Selles-Saint-Denis, France
- Orlican, Orlican Národní Podnik – Czech Republic
- Oskbes-Mai, Otraslevoe Spetsialnoe Konstruktorskoe Byuro Eksperimentalnogo Samolyotostroeniya-Moskovskogo Aviatsionnogo Instituta – Russia
- Osprey, Osprey Aircraft – United States
- Österreichische-Ungarische Albatros Flugzeug Werke, Österreichische-Ungarische Albatros Flugzeug Werke – Austro-Hungarian Empire, (1914–1917) > Phoenix Flugzeugwerke
- Ottawa Car Manufacturing, Ottawa Car Manufacturing – Canada, (Ottawa Car Company, The Ottawa Car and Aircraft Company)
- Ozone Gliders, Le Bar-sur-Loup, France
- PacAero, PacAero Engineering Corporation – United States
- PACI, Philippine Aircraft Company Inc – Philippines
- Pacific Aero, Pacific Aero-Products Co. – United States, (1916–1917) > Boeing
- Pacific Aerospace, Pacific Aerospace Corporation Ltd – New Zealand
- Pacific Airmotive, Pacific Airmotive Corporation – United States
- PADC, Philippine Aerospace Development Corporation – Philippines
- PAI, Pacific Aeronautical Inc – Philippines
- PAC, Pakistan Aeronautical Complex – Pakistan
- Palladium Autocars, Palladium Autocars Ltd. – United Kingdom, (1911–1925)
- Panavia, Panavia Aircraft GmbH – Germany/United Kingdom/Italy
- Pander & Son, Nederlandse Fabriek van Vliegtuigen H. Pander & Zonen – Netherlands
- Panha, Panha – Iran, (Iran Helicopter Support and Renewal Company)
- Panzl, Greg Panzl – United States
- Papa 51, Papa 51 Ltd – United States
- Paraavis, Moscow, Russia
- Paradelta Parma, Parma, Italy
- Paradise Aircraft, Paradise Industria Aeronautica Ltda, Feira de Santana, Brazil
- Paramania LLC, London, UK
- Paramotor Inc., Oyster Bay, New York, United States
- Paramotor Napedy Paralotniowe, Warsaw, Poland
- Paramotor Performance, Bandhagen, Sweden
- Paramount, Paramount Aircraft Corporation – United States
- Paraplane International, Medford, New Jersey, United States
- Parapower, Pilchowo, Poland
- Parascender Technologies Inc., Kissimmee, Florida, United States
- de, Schwanewede, Germany
- Paratech, Paratech AG, Appenzell, Switzerland
- Paratour, Saint-Chrysostome, Quebec, Canada
- Paratrek, Auburn, California, United States
- Parker, Cal Y. Parker – United States
- Parnall, George Parnall & Company Ltd – United Kingdom
- Parrish Aircraft Xperimental Inc, Plantation, Florida, United States
- Partenair, Partenair Design Inc – Canada
- Partenavia, Partenavia Costruzione Aeronautiche SpA – Italy
- Pasotti, Legnami Pasotti SpA – Italy
- Paulista, Companhia Aeronáutica Paulista – Brazil
- Pawnee Aviation, Pawnee Aviation, Inc., Longmont, Colorado, and later McCook, Nebraska, United States
- Paxman’s, Paxman’s Northern Lite Aerocraft Inc – Canada
- Payne, Vernon W. Payne – United States
- Pazmany, Ladislao Pazmany – United States
- Pazmany, Pazmany Aircraft Corporation – United States
- PCV, Pregiate Costruzioni Volanti – Italy
- Pegas 2000, Prague, Czech Republic
- Pegase Aero, Pegase Aero Enr – Canada
- Pelegrin Limited, Adazi, Latvia
- Pemberton-Billing Ltd, England (1913–1916) > Supermarine Aviation Works Ltd.
- Pena, Louis Pena – France
- Pennec-Lucas, Serge Pennec & Paul Lucas – France
- Percival, Percival Aircraft Ltd – United Kingdom
- Peregrine, Peregrine Flight International – United States
- Pereira, George Pereira – United States
- Performance Aircraft, Olathe, Kansas, United States
- Personal Flight, Chelan, Washington, United States
- Pfalz, Pfalz Flugzeug-werke GmbH – Germany
- Phillips, Peter J. C. Phillips – United Kingdom
- Phillips & Powis, Phillips & Powis Aircraft (Reading) Ltd – United Kingdom
- Phillips & Powis, Phillips & Powis Aircraft Ltd – United Kingdom
- Phoenix, Phoenix Aircraft Ltd – United Kingdom
- Phoenix-Aviacor, Phoenix OKB, Aviakor Mezhdunarodnaya Aviatsionnaya Korporatsiya OAO – Russia
- Phoenix Flugzeugwerke, Phoenix Flugzeugwerke – Austro-Hungarian Empire, (1917–?)
- Phoenix Gleitschirmantriebe, Würselen, Germany
- Phoenix Industries, Inc., Southampton, New Jersey, United States
- Phönix, Phönix – Austro-Hungarian Empire, (1914–1919)
- Piaggio, Industrie Aeronautiche e Meccaniche Rinaldo Piaggio SpA – Italy
- Piaggio, Piaggio & Companie SpA – Italy
- Piaggio, Piaggio Aero Industries SpA – Italy
- Piaggio-Douglas, see PIAGGIO and DOUGLAS – Italy/United States
- Piasecki, Piasecki Helicopter Corporation – United States
- Piel, Avions Claude Piel – France
- Piel, Claude Piel – France
- Piel, Etablissements Claude Piel – France
- Piel, Piel Aviation SA – France
- Pietenpol, Bernard H. Pietenpol – United States
- PIK, Polyteknikkojen Ilmailukerho – Finland
- Pilatus, Pilatus Flugzeugwerke AG – Switzerland
- Pilatus Britten-Norman, Pilatus Britten-Norman Ltd – United Kingdom, (PBN)
- Pilots Right Stuff, Brannenburg, Germany
- Piper, Piper Aircraft Corporation – United States
- Pipistrel d.o.o. – Slovenia
- Pitcairn, Pitcairn Aircraft, Inc. – United States
- Pitcairn-Cierva, Pitcairn-Cierva Autogiro Company – United States, (1929–?)
- Pitts, Curtis Pitts – United States
- Pitts, Pitts Aerobatics – United States
- Pitts, Pitts Aviation Enterprises – United States
- Plage & Laskiewicz, Zaklady Mechaniczne A. Plage i T. Laskiewicz – Poland, (1920–1935) (Mechanical Works A. Plage & T. Laskiewicz) > LWS
- Plan, Max Plan – France
- Plumb, Plumb – United States
- Pober, Paul H. Poberezny – United States
- Podesva, Peter Podesva – Czech Republic
- Podesva, Tomás Podesva – Czech Republic
- Polikarpov, Polikarpov OKB – Russia
- Politechnika Warszawska, Politechnika Warszawska – Poland
- Pop’s Props, Cooksville, Illinois, United States
- Porterfield, Porterfield Aircraft Corporation – United States
- Portsmouth Aviation, Portsmouth Aviation Ltd, United Kingdom
- Potez, Etablissements Henry Potez SARL – France
- Potez, Société des Avions et Moteurs Henry Potez – France
- Potez Air-Fouga, Potez Air-Fouga – France
- Pottier, Avions Pottier – France
- Pottier, Jean Pottier – France
- Powell, John C. Powell – United States
- Practavia, Practavia Ltd – United Kingdom
- Prescott, Prescott Aeronautical Corporation – United States
- Private Explorer, Private Explorer Inc – United States
- Procaer, Progetti Costruzioni Aeronautiche SpA – Italy
- Pro-Design, Natters, Austria
- Professional Aviation, Professional Aviation Services (Pty) Ltd – South Africa
- Progressive Aerodyne, Progressive Aerodyne Inc – United States
- Promavia, Promavia SA – Belgium
- Protech, ProTech Aircraft Inc – United States
- Pro Sport Aviation, Wingate, North Carolina, United States
- Prowler, Prowler Aviation Inc – United States
- Pulsar, Pulsar Aircraft Corporation – El Salvador-United States
- Putzer, Alfons Pützer KG – Germany
- PWS, Podlaska Wytwórnia Lotnicza – Poland, (WSK-PZL) (Panstowe Zaklady Lotnicze)
- PZL-Mielec, Polskie Zaklady Lotnicze Sp z oo – Poland
- PZL-Mielec, Wytwórnia Sprzetu Komunikacyjnego-Panstwowe Zaklady Lotnicze Mielec – Poland, (Wytwornia Sprzetu Komunikacyjnego – Transport Equipment Manufacturing Centre)
- PZL-Mielec, Wytwórnia Sprzetu Komunikacyjnego-Panstwowe Zaklady Lotnicze Mielec SA – Poland
- PZL-Okecie, Centrum Naukowo-Produkcyjne Samolotow Lekkich-Panstwowe Zaklady Lotnicze Warszawa – Poland
- PZL-Okecie, EADS PZL Warszawa-Okecie SA – Poland
- PZL-Okecie, Panstwowe Zaklady Lotnicze Warszawa-Okecie – Poland
- PZL-Okecie, Panstwowe Zaklady Lotnicze Warszawa-Okecie SA – Poland
- PZL-Okecie, Wytwórnia Sprzetu Komunikacyjnego-Panstwowe Zaklady Lotnicze Okecie – Poland
- PZL-Okecie, Wytwórnia Sprzetu Komunikacyjnego-Panstwowe Zaklady Lotnicze Warszawa-Okecie – Poland
- PZL-Swidnik, Wytwórnia Sprzetu Komunikacyjnego Im. Zygmunta Pulawskiego-Panstwowe Zaklady Lotnicze Swidnik – Poland
- PZL-Swidnik, Wytwórnia Sprzetu Komunikacyjnego-Panstwowe Zaklady Lotnicze Swidnik – Poland
- PZL-Swidnik, Zygmunta Pulawskiego-Panstwowe Zaklady Lotnicze Swidnik SA – Poland
- Quad City, Quad City Ultralight Aircraft Corp – United States
- Quasar, Dolní Bečva, Czech Republic
- Quercy, Centre National Quercy-Rouergue RSA – France
- Quest, Quest Aircraft Company LLC – United States
- Questair, Questair, Inc. – United States
- Quickie, Quickie Aircraft Corporation – United States
- Quickie, Quickie Enterprises, Inc. – United States
- Quikkit, Quikkit Corporation – United States
- Quikkit, Quikkit Division of Rainbow Flyers, Inc. – United States
- Quikkit, Quikkit, Inc. – United States
- Qantas, Qantas, Inc. Australia
- R & B, R & B Aircraft Company – United States
- RACA, Representaciones Aero Comerciales Argentinas SA – Argentina
- Radab, AB Radab – Sweden
- Radiant Power Corp., Radiant Power Corp. – A Heico Company – United States
- RAF (1), Royal Aircraft Factory – United Kingdom, > Royal Aircraft Establishment
- Rad Aviation, Kidlington, United Kingdom
- Ragwing, RagWing Aircraft Designs – United States
- Rainbow, Rainbow Aircraft (Pty), Ltd. – South Africa
- Rand, Kenneth Rand – United States
- Rand, Rand Robinson Engineering, Inc. – United States
- Ranger Aircraft Corp. – United States (1929, Oklahoma City OK, upon acquiring design and production rights of Coffman Monoplanes Inc.)
- Rans, Rans, Inc. – United States (Randy Schlitter, Hays KS) kit-built small aircraft
- Raven Rotorcraft, Boulder Colorado and later El Prado, New Mexico, United States
- Ravin, SA Ravin Composite Aircraft Manufacturers – South Africa
- Raytheon, Raytheon Aircraft Company – United States
- Raytheon, Raytheon Corporate Jets, Inc. – United Kingdom
- Rearwin, Rearwin Aircraft & Engines, Inc. – United States
- Rearwin, Rearwin Airplanes, Inc. – United States
- Reda, Reda-MDT, Ltd. – Russia
- Redback Aviation, Hoppers Crossing, Victoria, Australia
- Redfern, Walter Redfern Company – United States
- Reflex, Reflex Fiberglass Works, Inc. – United States
- Reflex Paramoteur, Chatou, France
- Regy Freres, Regy Freres – France
- Reims, Reims Aviation SA – France
- Renaissance (1), Renaissance Composites, Inc. – United States
- Renaissance (2), Renaissance Aircraft LLC – United States
- Renard, Robert Renard – France
- Renard, George & Alfred Renard
- Replica Plans, Replica Plans – Canada
- Republic, Republic Aviation Corporation – United States, (1939–?)
- Revolution, Revolution Helicopter Corporation, Inc. – United States
- Rhein, Rhein-Flugzeugbau GmbH – Germany, (RFB)
- Rhein-West-Flug, Rhein-West-Flug Fischer und Companie – Germany
- Rihn, Dan Rihn – United States
- Rihn, Rihn Aircraft Corporation – United States
- Rikugun, Rikugun Kokugijutsu Kenkyujo – Japan, (Army Aerotechnical Research Institute)
- Riley, Riley Aeronautics Corporation – United States, (?-1983) > Advanced Aircraft Corp
- Riley, Riley Aircraft Corporation – United States
- Riley, Riley Aircraft Manufacturing, Inc. – United States
- Riley, Riley International Corporation – United States
- Riley, Riley Turbostream Corporation – United States
- RLU, Charles B. Roloff, Robert Liposky and Carl Unger – United States
- Robin, Avions Pierre Robin – France, (1969–present)
- Robin, Avions Pierre Robin, Inc. – Canada
- Robin, Robin Aviation – France
- Robinson, Robinson Helicopter Company – United States
- Rock, J. Rock Segelflugzeugbau – Germany
- Rocket, Rocket Aircraft Company – United States
- Rockwell, Rockwell International Corporation – United States, (1966–1996) > Boeing North American
- Rockwell-MBB, see ROCKWELL and MBB – United States/Germany
- Rogerson Hiller, Rogerson Hiller Corporation – United States
- Rogozarski, P. S. F. A. -Rogozarski – Yugoslavia, (1924–1941) (First Serbian Aircraft Factory-Rogozarski)
- Rokospol Aviation, Prague, Czech Republic
- Rolladen-Schneider, Rolladen-Schneider Flugzeugbau GmbH – Germany
- Rollason, Rollason Aircraft and Engines, Ltd. – United Kingdom
- Roll Flight, Schwelm, Germany
- Romaero, SC Romaero SA – Romania
- Rose, Rose Aeroplane and Motor Company – United States
- Rotary Air Force, Rotary Air Force, Inc. – Canada
- Rotec, Rotec Engineering, Inc. – United States
- Rotor Flight Dynamics, Wimauma, Florida, United States
- Rotortec GmbH, Görisried, Allgäu, Germany
- RotorWay International, Chandler, Arizona, United States
- Rotorwing-Aero, Salt Lake City, Utah, United States
- Rouchaud, F. Rouchaud, Construction Aéronautique – France
- Rousseau, Etablissements Rousseau Aéronautique – France
- RTAF, Royal Thai Air Force – Thailand
- RUAG, RUAG Aerospace – Switzerland
- Rumpler, Edmund Rumpler – Austria, (Rumpler Flugzeugwerke GmbH)
- Rupert, Charles Rupert Joses – Brazil
- Ruschmeyer, Ruschmeyer Luftfahrttechnik GmbH – Germany
- Rusjan Brothers, Rusjan Brothers – Austro-Hungarian Empire, (Edvard & Josiph (Jože) Rusjan)
- Rutan, Rutan Aircraft Factory – United States, (Scaled Composites)
- RWD, Rogalski, Wigura and Drzewiecki – Poland
- Ryan, Ryan Aeronautical Company – United States
- Saab AB, Saab AB – Sweden
- Saab, Saab Aircraft AB – Sweden
- Saab, Saab-Scania AB – Sweden
- Saab, Svenska Aeroplan AB Saab – Sweden
- Saab-Fairchild, see SAAB and FAIRCHILD – Sweden/United States
- SAASA, Servicios Aéreas de America SA – Mexico
- Sabrina Aircraft Manufacturing – United States
- SABCA, Société Anonyme Belge de Constructions Aéronautiques – Belgium
- Sadler, Sadler Aircraft Corporation – United States
- SAI (1), Skandinavisk Aero Industri AS – Denmark
- SAI (2), SAI Società Aeronautica Italiana srl – Italy
- Sailplane Corporation of America – United States
- Saint Germain, Centre de Recherches Jean Saint Germain, Inc. – Canada
- Salvay-Stark, M. E. Salvay and George Stark – United States
- Samolot, Poland
- Samsung, Samsung Aerospace Industries Ltd – South Korea, (SSA) > Korea Aerospace Industries
- SAN, Société Aéronautique Normande – France
- Sanderson, Sanderson Machine Corporation – United States
- Sands, Ron Sands Company – United States
- Sargent-Fletcher, Sargent-Fletcher Company – United States
- SATIC, Special Aircraft Transport International Company – France/Germany
- SAU, Nauchno-Proizvodstvennaya Korporatsiya Samoloty-Amfibyi Universalnyye – Russia
- Saunders Aircraft, Saunders Aircraft Corporation – Canada
- Saunders-Roe, Saunders-Roe Limited – United Kingdom
- Sauper, Sauper Aviation SA – France
- Sauser, Sauser Aircraft Company – United States
- Savoia-Marchetti, Savoia-Marchetti – Italy, (1915–1951 & 1953–1983)
- Scaled, Scaled Composites, Inc. – United States
- Scaled Aviation Industries (Private) Limited, Scaled Aviation Industries (Private) Limited – Pakistan
- SCAN, Société des Constructions Aéro-Navales – France
- SCANOR, Société de Construction Aéronautique du Nord – France
- Scenic, Scenic Aviation Services – United States
- Schafer, Schafer Aircraft Modifications, Inc. – United States
- Scheibe, Scheibe Flugzeugbau GmbH – Germany
- Schempp-Hirth, Schempp-Hirth Flugzeugbau GmbH – Germany
- Schempp-Hirth, Schempp-Hirth GmbH – Germany
- Schempp-Hirth, Schempp-Hirth GmbH & Companie KG – Germany
- Schempp-Hirth, Schempp-Hirth OHG – Germany
- Schleicher, Alexander Schleicher GmbH & Co – Germany
- Schleicher, Alexander Schleicher Segelflugzeugbau – Germany
- Schneider, Edmund Schneider – Germany, Australia
- Schweizer, Schweizer Aircraft Corporation – United States
- Scintex, Scintex Aviation SA – France
- Scottish Aviation, Scottish Aviation, Ltd. – United Kingdom, (?-1977) > British Aerospace
- SC Paragliding, Kharkiv, Ukraine
- SCWAL, SCWAL SA – Belgium
- SEA, Société d’Etudes Aéronautiques – France
- Seabird, Seabird Aviation Australia Pty, Ltd. – Australia
- Seabird, Seabird Aviation Jordan LLC – Jordan
- Seastar, SeaStar Aircraft, Inc. – United States
- SET, Societatea pentru exploatari technice – Romania
- Seawind, Seawind, Inc. – United States
- Seat Air Systems, Inc.,Seat Air Systems, Inc.,- United States
- Seawind, Seawind International, Inc. – Canada
- Seawind, SNA, Inc. – United States
- SECM, SECM – France, (1916–1921) > Amiot
- Seedwings Europe, Schlitters, Austria
- SEGA Aircraft, SEGA Aircraft – Belgium
- Seginus Inc, Seginus Inc – United States
- Sepecat, Société Européenne de Production de l’Avion ECAT – France/United Kingdom
- Sequoia, Sequoia Aircraft Corporation – United States
- SEREB, SEREB – France, (1959–1970) (Ballistic Missiles Study and Manufacture Company) > Aérospatiale
- Serv-Aero, Serv-Aero Engineering, Inc. – United States
- Servoplant, Servoplant SRL – Romania
- SETCA Société d’Études Techniques et de Constructions Aéronautiques – France
- Seversky, Seversky Aircraft Corporation – United States, > Republic Aviation Company
- SF, Swiss Aircraft and Systems Enterprise Corporation – Switzerland
- SFECMAS, Societe Francaise d’Etudes et de Constructions de Materials – France, (1953–1955) (Société Française d’Etude et de Construction de Matériels Aéronautiques Spéciaux – French Company for the study and construction of special aeronautical materials) > SNCAN
- SFERMA, Societe Francaise d’Entretien et de Reparation de Materiel Aeronautique – France, (Maintenance and Aeronautical Material Repairs Company of France)
- SG Aviation, SG Aviation – Italy
- SGAU, Samarsky Gosudartvennyi Aerokosmitsesky Universitet – Russia
- Shaanxi, Shaanxi Aircraft Company – China
- Shaanxi, Shaanxi Transport Aircraft Factory – China
- Shadin, Shadin LP – United States
- Shanghai, Shanghai Aircraft Manufacturing Factory – China
- Shanghai, Shanghai Aviation Industrial Corporation – China
- Shanghai Sikorsky, Shanghai Sikorsky Aircraft Company, Ltd. – China
- Shenyang, Shenyang Aircraft Corporation – China
- Shenyang, Shenyang Aircraft Factory – China
- Shenyang Sailplane, Shenyang Sailplane and Lightplane Factory – China
- Shenyang Sailplane, Shenyang Sailplane Factory – China
- Sherpa, Sherpa Aircraft Manufacturing Company – United States
- Shijiazhuang, Shijiazhuang Aircraft Manufacturing Corporation – China
- Shijiazhuang, Shijiazhuang Aircraft Plant – China
- Shin Meiwa, Shin Meiwa Industry Company, Ltd. – Japan
- Shin Meiwa, ShinMaywa Industries, Ltd. – Japan
- Shin Meiwa, ShinMaywa Kogyo KK – Japan
- Shinn, Shinn Engineering, Inc. – United States
- Short, Short Brothers & Harland, Ltd. – United Kingdom, (?-1989) > Bombardier Aerospace
- Short, Short Brothers, Ltd. – United Kingdom
- Short, Short Brothers PLC – United Kingdom
- Showa, Showa Aircraft Industry Co., Ltd. – Japan
- Showers-Aero, Milton, Pennsylvania, United States
- SIAI-Marchetti, SIAI-Marchetti SpA – Italy
- SIAT, Siebelwerke-ATG GmbH – Germany
- Siddeley-Deasy, Siddeley-Deasy Motor Car Co., Ltd.. – United Kingdom, > Armstrong Siddeley
- Siebel, Siebel-Flugzeugwerke AG – Germany, (1955–1970) (Siebel Aircraft Factory) > MBB
- Siemens-Schuckert, Siemens-Schuckertwerke – Germany
- Sikorsky, Sikorsky Aircraft Division of United Aircraft Corporation – United States
- Sikorsky, Sikorsky Aircraft Division of United Technologies Corporation – United States
- Silhouette, Silhouette Aircraft, Inc. – United States
- Silvaire, Silvaire Aircraft Company – United States
- Silvercraft, Silvercraft SpA – Italy
- Sindlinger, Fred G. Sindlinger – United States
- Singapore, Singapore Aerospace, Ltd. – Singapore
- Singapore, Singapore Aircraft Industries Pte, Ltd. – Singapore
- Singapore, Singapore Technologies Aerospace, Ltd. – Singapore
- Sino Swearingen Aircraft Corporation – United States/China-Taiwan
- SIPA, Société Industrielle pour l’Aéronautique – France
- Siravia, Siravia SA – France
- Sisler, Sisler Aircraft Company – United States
- SITAR, Sociètè Industrielle de Tolerie pour l’Aéronautique et Matériel Roulant – France
- Sivel, Sivel Srl – Italy
- Skif Paragliding, Feodosia, Ukraine
- Skliar, Bill Skliar – United States
- Skycraft, Skycraft International, Inc. – United States
- Skydancer, SkyDancer Aviation – United States
- Skyfox, Skyfox Aviation, Ltd. – Australia
- Skygear, Korean Light Aircraft Corporation – South Korea
- Skyleader, Jihlava, Czech Republic
- Skymaster Powered Parachutes, Hartland, Wisconsin, United States
- Skyote Aeromarine, Skyote Aeromarine, Ltd. – United States
- Sky Paragliders, Frýdlant nad Ostravicí, Czech Republic
- Skyrider Flugschule – Germany
- Skyrunner Paramotor Laboratory, Pskov, Russia
- Sky Science, Tidworth, United Kingdom
- Skystar, Skystar Aircraft Corporation – United States
- Skywalk GmbH & Co. KG, Marquartstein, Bavaria, Germany
- Skyway Products, Ettenheim, Germany
- Slepcev, Slepcev Aircraft Industries – Australia
- Slingsby, Slingsby Aviation, Ltd. – United Kingdom
- Slipstream, SlipStream Industries, Inc. – United States
- SMAN, Société Morbihannaise d’Aéro Navigation – France
- SME, SME Aviation Sdn Bhd – Malaysia
- Smith (1), Frank W. Smith – United States
- Smith (2), Wilbur L. Smith – United States
- Smith (3), Barry Smith – United Kingdom
- Smyth, Jerry Smyth – United States
- SNCA, Société Nationale de Constructions Aéronautiques – France
- SNCAC, Société Nationale de Constructions Aéronautiques du Centre – France, (1936–1949) (SNCAC) (Aérocentre) > SNCAN, SNCASO, SNECMA
- SNCAN, Societe Nationale de Construction Aeronautique du Nord – France
- SNCAO, Société Nationale des Constructions Aéronautiques de l’Ouest – France
- SNCASO – France
- SNECMA, Société Nationale d’Étude et de Construction de Moteurs d’Aviation – France, (1956–1959) (National Company for the Study and Construction of Aviation Engines)
- Snobird, SnoBird, Inc. – United States
- Snow, Snow Aeronautical Company – United States
- Snow, Snow Aeronautical Corporation – United States
- Soaring Concepts, Sturgis, Michigan, United States
- Société Nouvelle d’Aviation Sportive (Stryke-Air), Noillac, France
- SOCA, Société de l’Ouest de Construction Aéronautique – France
- SOCATA, Socata Group Aerospatiale – France
- SOCATA, Socata Group Aerospatiale Matra – France
- SOCATA, Société de Construction d’Avions de Tourisme et d’Affaires – France
- Soko, Preduzece Soko – Bosnia-Hercegovina
- Soko, Soko Air Mostar – Bosnia-Hercegovina
- Soko, Soko Metalopreradijavacka Industrija sa Organicenom Solidarnom Odgovornoscu Oour-A Oour Fabrika Vazduhoplova – Bosnia-Hercegovina
- Soko, Soko Vazduhoplovna Industrija Radna Organizacija Vazduhoplovstvo – Bosnia-Hercegovina
- Soko, Sour Vazduhoplovna Industrija Soko – Bosnia-Hercegovina
- Soko, Vazduhoplovna Industrija Soko DD – Bosnia-Hercegovina
- Soko-Cniar, see SOKO and CNIAR – Bosnia-Hercegovina/Romania
- Sokopf, Innsbruck, Austria
- Solar Turbines – Solar Aircraft Company – United States
- Solar Wings, United Kingdom
- Solid Air UL-Bau Franz – Hundheim, Rheinland-Pfalz, Germany
- Solo Wings, Gillitts, KwaZulu-Natal, South Africa
- Soloy, Soloy Conversions, Ltd. – United States
- Sol Paragliders, Jaraguá do Sul, Brazil
- Sonex, Sonex, Ltd. – United States
- Sopwith, The Sopwith Aviation Company, Ltd. – United Kingdom
- Sorrell Aviation, C. Hobart Sorrell, Tenino, Washington, United States
- Sorrell, Sorrell Aviation – United States
- SPAD, Société Pour L’Aviation et ses Dérivés – France, (1910–1914) (1914-Post war) (Originally Société Pour les Appareils Deperdussin) > Blériot-SPAD
- Southern Powered Parachutes, Nicholson, Georgia, United States, (formerly called Condor Powered Parachutes)
- Spartan, Spartan Aircraft Company – United States
- Spartan Aircraft Ltd, United Kingdom
- Spartan Microlights, Astoria, New York, United States
- Specter Aircraft, Bancroft, Idaho, United States
- Spectrum Aeronautical – United States
- Spectrum Aircraft – (1983–1992) – Canada
- Speedtwin, Speedtwin Developments, Ltd. – United Kingdom
- Spencer, P. H. Spencer – United States
- Spencer, Spencer Amphibian Aircraft, Inc. – United States
- Sperwill Ltd, Bristol, United Kingdom
- Spezio, Tony and Dorothy Spezio – United States
- Spitfire, Spitfire Helicopter Company, Ltd. – United States
- Spirit, Spirit AeroSystems, Inc. – United States
- Sport 2000, Capena, Italy
- Sport Racer, Sport Racer, Inc. – United States
- Sportavia-Putzer, Sportavia-Pützer GmbH u. Co. KG – Germany
- Spratt, George G. Spratt – United States
- Spring, W. Spring – Canada
- SSH, Serwis Samolotow Historycznich – Poland
- Croix, St. Croix Aircraft – United States
- Just, St. Just Aviation, Inc. – Canada
- Stampe, Stampe & Renard – Belgium
- Stampe, Stampe & Vertongen – Belgium
- Standard Aircraft Corporation, Standard Aircraft Corporation – United States
- Standard Motors, Standard Motor Company – United Kingdom
- Starck, André Starck – France
- Starfire, Starfire Aviation, Inc. – United States
- Stargate, Inc, McMinnville, Oregon, United States
- Stark, Stark Flugzeugbau KG – Germany
- Stark, Stark Iberica SA – Spain
- Starkraft, Starkraft – United States
- Stark-Trefethen, George Stark and Al Trefethen – United States
- Star-Lite, Star-Lite Aircraft – United States
- Starpac, Star of Phoenix Aircraft – United States
- Statler, William H. Statler – United States
- Staudacher, Staudacher Aircraft, Inc. – United States
- Stearman, Stearman Aircraft Company – United States, (1927–1939) > Boeing
- Steen, Lamar Steen – United States
- Stemme, Stemme Gmbh & Co KG – Germany
- Stephens, C. L. Stephens – United States
- Stern, René Stern – France
- Stern-Mallick, René Stern et Richard Mallick – France
- Stewart Aircraft Corporation, Stewart Aircraft Corporation – United States
- Donald Stewart, Donald Stewart – United States
- F. Stewart Company, Flint, Michigan, United States
- Stinson, Stinson Aircraft Corporation – United States
- Stinson, Stinson Division of Consolidated Vultee Corporation – United States
- Stits, Stits Aircraft – United States
- Stoddard-Hamilton, Stoddard-Hamilton Aircraft, Inc. – United States
- Stolp, Louis A. Stolp – United States
- Storch Aviation, Storch Aviation Australia Pty, Ltd. – Australia
- Storm Aircraft, also called the StormAircraft Group, Sabaudia, Italy
- Stout, Stout Metal Airplane Company – United States
- Stratos Aircraft, Redmond, Oregon, United States
- Streamline Welding, Streamline Welding, Inc. – Canada
- Striplin, Striplin Aircraft Corporation – United States
- Strojnik, Prof. Alex Strojnik – United States
- Stroukoff, Stroukoff Aircraft Corp. – United States
- SUD, Sud-Aviation, Société Nationale de Constructions Aéronautiques – France, (1957–1970) > Aérospatiale
- Sud-Est, Société Nationale de Constructions Aéronautiques du Sud-Est – France, (?-1957) (SNCASE) > Sud-Aviation
- Sud-Est, Sud-Est Aviation – France
- Sudflug, Flugzeug-Union-Süd – Germany
- Sud-Ouest, Ouest-Aviation – France, (1936–1957) (SNCASO) > Sud-Aviation
- Sud-Ouest, Société Nationale de Constructions Aéronautiques du Sud-Ouest – France
- Sukhoi, Gosudarstvennoye Unitarnoye Predpriyatie Aviatsionnyi Voyenno-Promyshlennyi Komplex Sukhoi – Russia, (1939–present)
- Sukhoi, Opytnyi Konstruktorskoye Buro Sukhogo AOOT – Russia
- Sukhoi, Sukhoi OKB – Russia
- Summit, Summit Aviation, Inc. – United States
- Sun Lake, Sun Lake Aircraft – United States
- Sunderland, Sunderland Aircraft – United States
- Sundog Powerchutes Inc, Pierceland, Saskatchewan, Canada
- Sun Flightcraft (Hofbauer GmbH), Innsbruck, Austria
- Supapup, Supapup Aircraft, Division of Teknico Pty, Ltd. – Australia
- Super-Chipmunk, Super-Chipmunk, Inc. – Canada
- Supermarine, Supermarine Aviation Works (Vickers), Ltd. – United Kingdom
- Supermarine, Vickers-Armstrongs (Aircraft), Ltd. (Supermarine Division) – United Kingdom
- Supermarine, Vickers-Armstrongs, Ltd. (Aircraft Section) (Supermarine Division) – United Kingdom
- Supermarine Aircraft, Supermarine Aircraft PL – Australia
- Suresnes – see Ateliers Aéronautiques de Suresnes
- Svenska Aero, Svenska Aero – Sweden
- Swallow, Swallow Airplane Company – United States
- Swearingen, Swearingen Aircraft – United States
- Swearingen, Swearingen Aircraft Corporation – United States
- Swearingen, Swearingen Aircraft, Inc. – United States
- Swearingen, Swearingen Aviation Corporation – United States
- Swearingen, Swearingen Engineering and Technology, Inc. – United States
- Swift Aircraft – Swift Aircraft, Norwich – United Kingdom
- Swing Flugsportgeräte, Landsberied, Germany
- Swing-Europe, Ebringen, Germany
- Symphony Aircraft Industries – Trois-Rivieres, Quebec, Canada
- Synairgie, Synairgie – France
- SZD, Przedsiebiorstwo Doswiadczalno Produkcyjne Szybownictwa-Panstwowe Zaklady Lotnice Bielsko – Poland
- SZD, Szybowcowy Zaklad Doswiadczalny – Poland
- TAI, Turkish Aerospace Industries – Turkey
- Taifun, Taifun Experimental Design Bureau – Russia
- Taiwan Dancer, Nangang Village, Dayuan District, Taoyuan City, Taiwan
- Tamarind, Tamarind International Ltd – United States
- Tampier, Tampier – France
- Taneja, Taneja Aerospace and Aviation Ltd – India
- Tapanee, Tanapee Aviation Inc – Canada
- Taylor (1), Taylor Aircraft Company – United States
- Taylor (2), Moulton B. Taylor – United States
- Taylor (3), C. Gilbert Taylor – United States
- Taylor (3), Taylor Aero Inc – United States
- Taylor (4), John F. Taylor – United Kingdom
- Taylor Kits, Taylor Kits Corporation – United States
- Taylorcraft (1), Taylorcraft Aircraft – United States
- Taylorcraft (1), Taylorcraft Aviation Company – United States
- Taylorcraft (1), Taylorcraft Aviation Corporation – United States
- Taylorcraft (1), Taylorcraft Inc – United States
- Taylorcraft (2), Taylorcraft Aeroplanes (England) Ltd – United Kingdom, (1938–1946) > Auster
- Taylor-Young, Taylor-Young Airplane Company – United States
- TBM, TBM Corporation – France/United States
- TBM, TBM SA – France
- Teal, Teal Aircraft Corporation – United States
- Team Rocket, Team Rocket Inc – United States
- Team Tango, Revolution Aviation Inc., Williston, Florida, United States
- Tech’aero, Tech’Aero – France
- Technic’air, Belvès, France
- Technoavia, Nauchno-Kommerchesky Firma Technoavia – Russia
- Technoflug, Technoflug Leichtflugzeugbau GmbH – Germany
- Tecma Sport, La Roche-sur-Foron, France
- Tecnam, Costruzioni AeronauticheTecnam Srl – Italy
- Ted Smith, Ted R. Smith & Associates – United States
- Ted Smith, Ted Smith Aerostar Corporation – United States
- Ted Smith, Ted Smith Aircraft Company Inc – United States
- Temco, Temco Aircraft Corporation – United States
- Temco, Texas Engineering & Manufacturing Company Inc – United States
- Tennessee Valley, Tennessee Valley Aviation Products Ltd – United States
- Teratorn Aircraft, Clear Lake, Iowa, United States
- Terr-Mar, Terr-Mar Aviation Corporation – Canada
- Terzi, Terzi Aerodine – Italy
- Texas Airplane, Texas Airplane Factory – United States
- Texas Helicopter, Texas Helicopter Corporation – United States
- Thomas-Martin, Thomas-Martin – Unknown
- Thaden Metal Aircraft Company, United States
- The Airplane Factory, Tedderfield Airpark, Eikenhof, Johannesburg South, South Africa
- Theiss Aviation, Salem, Ohio, United States
- Thorp, John W. Thorp – United States
- Thorp, Thorp 211 Aircraft Company Inc – United States
- Thorp, Thorp Aero Inc – United States
- Thorp, Thorp Aircraft – United States
- Thorp, Thorp Engineering Company – United States
- Thrush, Thrush Aircraft Inc – United States
- Thruster Air Services, Langworth, Lincoln, England, United Kingdom
- Thunder Wings, Thunder Wings, Division of Thunder Development Inc – United States
- Thurston, Thurston Aeromarine Corporation – United States
- Thurston, Thurston Aircraft Corporation – United States
- Tiger, Tiger Aircraft LLC – United States
- Time to Fly, Kaunas, Lithuania
- Time Warp, Time Warp Aircraft Inc – United States
- Tipsy, Ernest Oscar Tips – Belgium
- Titan, Titan Aircraft Company – United States
- TM Aircraft, TM Aircraft – United States
- TNCA, Talleres Nacionales de Construcciones Aeronáuticas – Mexico
- Tomark, Tomark s.r.o., Prešov, Slovakia
- Toyota, Toyota Motor Corporation – Japan
- Tradewind Turbines, Tradewind Turbines Corporation – United States
- Trago Mills, Trago Mills – United Kingdom
- Transall, Arbeitsgemeinschaft Transall – Germany/France
- Transavia Corporation, Transavia Corporation Pty Ltd – Australia
- Transavia, Transavia Division of Transfield (NSW) Pty Ltd – Australia
- Trans-Florida, Trans Florida Aviation – United States, > Cavalier Aircraft
- Travel Air, Travel Air Company – United States, (1924–1931) > Curtiss-Wright Aeronautical Corporation
- Travel Air, Travel Air Manufacturing Company Inc – United States
- Trecker, Trecker Aircraft Corporation – United States
- Trekking Parapentes, Saint-Mathieu-de-Tréviers, France
- Triavio, (Triavio SRL), Catania, Italy
- Tridair, Tridair Helicopters Inc – United States
- Trident, Trident Aircraft Ltd – Canada
- Trio-Twister, Eichwalde, Germany
- TRI-R, Tri-R Technologies Inc – United States
- Triumph, Triumph Group Inc – United States
- Trixy Aviation Products GmbH, Dornbirn, Austria
- Tucker, Tucker Aviation Company – United States
- Tugan Aircraft, Tugan Aircraft Company Limited – Australia, (?-1936) > Commonwealth Aircraft Corporation
- Tupolev, Aviatsionny Nauchno-Tekhnishesky Kompleks Imeni A N Tupoleva OAO – Russia
- Tupolev, Tupolev OKB – Russia
- Turbine Design, Turbine Design Inc – United States
- Turner, E. L. Turner – United States
- TUSAS, TUSAS Aerospace Industries Inc – Turkey
- TUSAS, TUSAS Havacilik ve Uzay Sanayi AS – Turkey
- TUSCO, Tulsa Manufacturing Corporation – United States
- TWI, TWI Flugzeuggesellschaft mbH – Germany
- Udet, Udet-Flugzeugbau GmbH – Germany
- Uetz, Walter Uetz Flugzeugbau – Switzerland
- UL-Jih, Kaplice, Czech Republic
- UFO, Ultimate Flying Object Inc – New Zealand
- Ullmann, Ullmann Aircraft Company – United States
- Ultimate, Ultimate Aircraft Division of Ultimate Aerobatics Ltd – Canada
- Ultravia, Ultravia Aero International Inc – Canada
- Umbaugh, Umbaugh Aircraft Corporation – United States
- Umbra, Aeronautica Umbra – Italy
- UNC, UNC Helicopter – United States
- Unikomtranso, Unikomtranso AO – Russia
- Unis, Unis Obchodni spol sro – Czech Republic
- United Canada, United Aircraft of Canada – Canada
- United Aircraft Corporation, United Aircraft Corporation – Russia
- United Consultant, United Consultant Corporation – United States
- UP International GmbH, Garmisch-Partenkirchen, Germany, formerly known as UP Europe, UP Products and Ultralite Products
- Urban, Urban Air sro – Czech Republic
- Utilicraft Aerospace Industries, Utilicraft Aerospace Industries – United States
- U-Turn GmbH, Villingen-Schwenningen, Germany
- UTVA, UTVA Fabrika Aviona – Yugoslavia, (1937–Present)
- UTVA, UTVA-Sour Metalne Industrije, RO Fabrika Aviona – Yugoslavia
- Valentin, Valentin Flugzeugbau GmbH – Germany
- Valladeau, Valladeau – France
- Valmet, Valmet Aviation Industries – Finland
- Valmet, Valmet OY, Kuoreveden Tehdas (Kuorevesi Works) – Kuorevesi, Finland
- Valmet, Valmet OY, Lentokonetehdas (Aircraft Factory) – Tampere, Finland
- Valtion Lentokonetehdas (VL; Government Aircraft Factory) – Helsinki and Tampere, Finland
- Valtion Metallitehtaat (VMT; Government Metal Factories) – Finland
- Vancil, Belton, South Carolina, United States
- Van’s, Van’s Aircraft Inc – United States
- Vardax, Vardax Corporation – United States
- Varga, Varga Aircraft Corporation – United States
- VAT, Vertical Aviation Technologies Inc – United States
- VEB, Vereinigung Volkseigener Betriebe Flugzeugbau Dresden – Germany
- VEF, Valsts Elektrotehniska Fabrika – Latvia, (State Electrotechnical Plant)
- Veljekset Karhumaki, Veljekset Karhumaki OY – Finland
- Velocity, Velocity Inc – United States
- Venture, Venture Light Aircraft Resources LLC – United States
- Verilite, Verilite Aircraft Company Inc – United States
- Vertol, Vertol Aircraft Company – United States, (1956–1960) > Boeing
- VFW, Vereinigte Flugtechnische Werke GmbH – Germany
- Verville Aircraft – United States
- VFW, VFW-Fokker GmbH – Germany
- Vickers, Vickers (Aviation) Ltd – United Kingdom
- Vickers, Vickers-Armstrongs (Aircraft) Ltd – United Kingdom
- Vickers-Slingsby, Vickers-Slingsby Division of Vickers Ltd Offshore Engineering Group – United Kingdom
- Victa, Victa Ltd – Australia
- Victory Aircraft, Victory Aircraft Company – Canada, (?-1945) > Avro Canada
- Vidor, Giuseppe Vidor – Italy
- Viking Air, North Saanich, British Columbia, Canada
- Viking Aircraft Inc, Panama City Beach, Florida, United States
- Viking Aircraft LLC, Elkhorn, Wisconsin, United States
- Viking, Viking Aircraft Ltd – United States
- Viper, Viper Aircraft Corporation – United States
- Visionaire, VisionAire Corporation – United States
- Vitek, Kompaniya Vitek – Russia
- Voisin, Appareils d’Aviation Les Frères Voisin – France, (Les Frères Voisin)
- Volaircraft, Volaircraft Inc – United States
- Volmer, Volmer Aircraft – United States
- Volmer, Volmer Jensen – United States
- Volpar, Volpar Inc – United States
- Vortech, Inc., Fallston, Maryland, United States
- Vought, Vought Aircraft Company – United States, (1961–1976)
- Vought, Vought Corporation – United States
- Vought-Sikorsky, Vought-Sikorsky Division of United Aircraft – United States
- VSR, VSR – United States
- VSTOL, V-STOL Aircraft Corporation – United States
- VTOL Aircraft, VTOL Aircraft Pty Ltd – Australia
- Vulcan Motor and Engineering, Vulcan Motor and Engineering Company Ltd. – United Kingdom
- Vulcanair, VulcanAir SpA – Italy
- Vultee, Vultee Aircraft Division of Avco – United States, (?-1943) > Convair
- Vultee, Vultee Aircraft Inc – United States
- WACO, Weaver Aircraft Company – United States
- Waco, Advance Aircraft Company – United States
- Waco, Waco Aircraft Company – United States
- WACO Classic Aircraft, Waco Classic Aircraft Corporation – United States
- Wagaero, WagAero Inc, Lyons, Wisconsin, United States
- Walkerjet, Třemošná, Czech Republic
- Wallerkowski, Heinz Wallerkowski – Germany
- WAR, War Aircraft Replicas – United States
- WAR, War Aircraft Replicas International Inc – United States
- Warner (1), Richard Warner Aviation Inc – United States
- Warner Aircraft Corporation (c1930s) – United States
- Warner Aerocraft, United States
- Wasp Systems, later Wasp Flight Systems, Crook, Cumbria, United Kingdom
- Wassmer, Société des Etablissements Benjamin Wassmer – France
- Wassmer, Wassmer Aviation SA – France
- Watanabe, Watanabe Aircraft Plant – Japan, > Kyūshū
- Watson, Gary Watson – United States
- Weatherly, Weatherly Aviation Company Inc – United States
- Wedell-Williams, Wedell-Williams Air Service Corporation – United States
- Weir, G. and J. Weir – United Kingdom
- Wendt, Wendt Aircraft Engineering – United States
- Werft Warnemünde, Werft Warnemünde – Germany, (1917–1925) > Arado
- Weser Flugzeugbau GmbH, Weser Flugzeugbau GmbH – Germany, (Weserflug)
- West Australian Airways, West Australian Airways – Australia
- Western, Western Aircraft Supplies – Canada
- Westland, GKN Westland Helicopters Ltd – United Kingdom
- Westland, Westland Aircraft Ltd – United Kingdom
- Westland, Westland Helicopters Ltd – United Kingdom
- Weymann-Lepere, Weymann-Lepere (Societe des Avions) – France
- Whatley, Vascoe Whatley Jr – United States
- Wheeler, Wheeler Aircraft Company – United States
- Wheeler, Wheeler Technology Inc – United States
- White, E. Marshall White – United States
- White Lightning, White Lightning Aircraft Corporation – United States
- Whittlesey Body, Whittlesey Body Co. Inc. – United States
- Wilden, Helmut Wilden – Germany
- Wills Wing, Santa Ana, California, United States
- Windecker, Windecker Industries Inc – United States
- Windexair, Windexair AB – Sweden
- Winds Italia, Bologna, Italy
- Windspire Inc., Long Green, Maryland, United States
- Windtech Parapentes, Gijón, Spain
- Windward Performance, Windward Performance – United States
- Wing Aeronautical Solutions, Wing Aeronautical Solutions – Portugal
- Wing, Wing Aircraft Company – United States
- Wings of Change, Fulpmes, Austria
- Wings Of Freedom, Hubbard, Ohio, United States
- Wingtip To Wingtip, Wingtip to Wingtip LLC – United States
- Witteman-Lewis, Witteman-Lewis Aircraft Company- United States
- Wittman, Steve J. Wittman – United States
- Wolf, Donald S. Wolf – United States
- Wolfsberg, Wolfsberg Aircraft Corporation NV – Belgium
- Wolfsberg, Wolfsberg-Evektor SRO – Czech Republic
- Wolfsberg, Wolfsberg Letecká továrna SRO – Czech Republic
- Wombat Gyrocopters, St Columb, Cornwall, United Kingdom
- Woods, H. L. Woods – United States
- Worldwide Ultralite Industries, United States
- Wren, Wren Aircraft Corporation – United States
- Wright Aeronautical, Wright Aeronautical – United States, (1919–1929)
- Wright Company, Wright Company – United States, (1909–1916)
- Wright-Martin, Wright-Martin – United States, (1916–1919)
- WRM Motors of Oxford, WRM Motors of Oxford – United Kingdom, (William Richard Morris)
- Wrobel, Gerard Wrobel, Beynes, Alpes-de-Haute-Provence, France
- WSK, Wytwórnia Sprzetu Komunikacyjnego – Poland
- Wuhan, Wuhan Helicopter General Aviation Corporation – China
- Wüst, Wüst GmbH – Germany
- Wytwórnia i Naprawa Konstrukcji Lekkich (Wytwórnia i Naprawa Konstrukcji Lekkich) – Poland, (1996–1999)
- WZL 3, Wojskowe Zaklady Lotnicze Nr. 3 – Poland
- Xian, Xian Aircraft Company – China
- Xplorer UltraFlight, Cape Town, South Africa
- XtremeAir, Cochstedt, Germany
- Yakovlev, Moskovskii Mashinostroitelnyy Zavod “Skorost” Imeni A. S. Yakovleva – Russia
- Yakovlev, Opytno-Konstruktorskoye Byuro Imeni A S Yakovleva OAO – Russia
- Yakovlev, Yakovlev Aviatsionnoye Korporatsiya OAO – Russia
- Yakovlev, Yakovlev OKB – Russia
- Yalo, Zaklad Naprawy i Budowy Sprzetu Latajacego Yalo SC – Poland
- Yokosuka Naval Arsenal, Yokosuka Naval Arsenal – Japan, (aka First Naval Air Technical Arsenal)
- Zenair, Zenair Ltd – Canada
- Zenith, Zénith Aircraft Company – United States
- Zero Gravity Paragliders, JM International Company Limited, Seoul, South Korea
- ZLIN Aircraft, ZLIN Aircraft a.s. – Czech Republic
Manufacturers’ Codes The military assigned two-letter codes to identify the sources of aircraft and certain major components, hence a Liberator with a designation of B-24D-NK would quickly indicate its origin as the Nash-Kelvinator plant. Replacement parts would then preferably come from that source rather than other B-24 builders because of possible variations in tooling and assembly methods. This coding system helped in the bookkeeping and inventory departments, as well. |
| Code | MANUFACTURER |
| AD | Aero Design & Engr Co, Bethany OK |
| AE | Aeronca Aircraft Corp, Middletown OH |
| AG | Air Glider Inc, Akron OH |
| BA | Bell Aircraft Corp, Atlanta GA |
| BB | Babcock Aircraft, Deland FL |
| BC | Bell Aerosystems, Buffalo NY |
| BE | Bell Aircraft Corp, Buffalo NY |
| BF | Bell Aircraft Corp, Fort Worth TX |
| BH | Beech Aircraft Corp, Wichita KS |
| BL | Bellanca Aircraft Corp, New Castle DE |
| BN | Boeing Aircraft Co, Renton WA |
| BO | Boeing Aircraft Co, Seattle WA |
| BR | Briegleb Sailplanes, Beverly Hills CA |
| BS | Bowlus Sailplanes, San Francisco CA |
| BU | Budd Mfg Co, Philadelphia PA |
| BW | Boeing (Stearman) Aircraft Co, Wichita KS |
| CA | Chase Aircraft Co, West Trenton NJ |
| CC | Canadian Commercial Corp, Toronto ONT |
| CE | Cessna Aircraft Co, Wichita KS |
| CF | Consolidated-Vultee Aircraft Corp (Convair), Forth Worth TX |
| CH | Christopher Aircraft Co, St Louis MO |
| CK | Curtiss Airplane Div, Curtiss-Wright Corp, Louisville KY |
| CL | Culver Aircraft Corp, Wichita KS |
| CM | Commonwealth Aircraft, Kansas City KS |
| CN | Chase Aircraft Co, Willow Run MI |
| CO | Consolidated Aircraft Corp, San Diego CA |
| CR | Cornelius Aircraft Co, Dayton OH |
| CS | Curtiss Airplane Div, Curtiss-Wright Corp, St Louis MO |
| CU | Curtiss Airplane Div, Curtiss-Wright Corp, Buffalo NY |
| DC | Douglas Aircraft Co, Chicago IL |
| DE | Douglas Aircraft Co, El Segundo CA |
| DH | De Havilland Aircraft, Toronto ONT |
| DK | Douglas Aircraft Co, Oklahoma City OK |
| DL | Douglas Aircraft Co, Long Beach CA |
| DM | Doman Helicopters, Santa Monica CA |
| DO | Douglas Aircraft Co, Santa Monica CA |
| DT | Douglas Aircraft Co, Tulsa OK |
| FA | Fairchild Engine & Airplane Corp, Hagerstown MD |
| FB | Fairchild Engine and Airplane Corp, Burlington NC |
| FE | Fleet Aviation Ltd, Fort Erie ONT |
| FL | Fleetwings Div, Kaiser Cargo, Bristol PA |
| FO | Ford Motor Co, Willow Run MI |
| FR | Frankfort Sailplane Co, Joliet IL |
| FT | Fletcher Aviation Corp, Pasadena CA |
| GA | G & A Aircraft, Willow Grove PA |
| GC | Fisher Body Div, General Motors, Cleveland OH |
| GE | General Aircraft Corp, Astoria NY |
| GF | Globe Aircraft Corp, Forth Worth TX |
| GK | General Motors, Kansas Ciy KS |
| GM | Fisher Body Div, General Motors, Detroit MI |
| GN | Gibson Refrigerator, Greenville MI |
| GO | Goodyear Aircraft Co, Akron OH |
| GR | Grumman Aircraft Engr Corp, Bethpage NY |
| GT | Grand Central Aircraft Engr Co, Tucson AZ |
| GY | Gyrodyne Co of America, St James NY |
| HE | Helio Aircraft Corp, Norwood MA |
| HI | Higgins Aircraft, New Orleans LA |
| HI | Hiller Helicopter Corp, Palo Alto CA |
| HO | Howard Aircraft Corp, Chicago IL |
| HU | Hughes Aircraft Co, Culver City CA |
| IN | Interstate Aircraft & Engr Corp, El Segundo CA |
| KA | Kaman Helicopter Corp, Windsor Locks CT |
| KE | Kellett Autogyro Corp, Philadelphia PA |
| KM | Kaiser Mfg Corp, Willow Run MI |
| LK | Laister-Kauffman Aircraft Corp, St Louis MO |
| LM | Lockheed-Martin Aircraft Corp, Marietta GA |
| LO | Lockheed Aircraft Corp, Burbank CA |
| MA | Glenn L Martin Co, Baltimore MD |
| MC | McDonnell Aircraft Corp, St Louis MO |
| MD | Martin Co, Baltimore MD |
| MF | Martin Co, Orlando FL |
| MH | McCulloch Motors Corp, Los Angeles CA |
| MM | McDonnell Aircraft Corp, Memphis TN |
| MO | Glenn L Martin Co, Omaha NB |
| NA | North American Aviation, Inglewood CA |
| NC | North American Aviation, Kansas City KS |
| ND | Noorduyn Aviation Co, Montreal QUE |
| NF | North American Aviation, Fresno CA |
| NH | North American Aviation, Columbus OH |
| NI | North American Aviation, Downey CA |
| NK | Nash-Kelvinator Corp, Detroit MI |
| NO | Northrop Aircraft, Hawthorne CA |
| NT | North American Aviation, Dallas TX |
| NW | Nortwestern Aeronautical Corp, St Paul MN |
| PA | Piper Aircraft Corp, Lock Haven PA |
| PH | Piasecki Helicopter Corp, Morton PA |
| PI | Piper Aircraft Corp, Lock Haven PA |
| PL | Platt-Le Page Aircraft Co, Eddystone PA |
| PR | Gould Aeronautical, Pratt Read Co, Deep River CT |
| RA | Republic Aviation Corp, Evansville IN |
| RD | Read-York, Kenosha WI |
| RE | Republic Aviation Corp, Farmingdale NY |
| RI | Ridgefield Mfg Co, Ridgeville NJ |
| RO | Robertson Aircraft, St Louis MO |
| RP | Radioplane Co, Van Nuys CA |
| RY | Ryan Aeronautical Co, San Diego CA |
| SA | Stroukoff Aircraft Corp, West Trenton NJ |
| SE | Seibel Helicopter Co, Wichita KS |
| SI | Sikorsky Aircraft Div, United Aircraft Corp, Stratford CT |
| SL | St Louis Aircraft Corp, St Louis MO |
| SP | Spartan Aircraft Co, Tulsa OK |
| SW | Schweizer Aircraft Corp, Elmira NY |
| TA | Taylorcraft Aviation Corp, Alliance OH |
| TG | Texas Engr & Mfr Co (TEMCO), Greenville TX |
| TI | Timm Aircraft Corp, Van Nuys CA |
| TP | Texas Engr & Mfr Co (TEMCO), Grand Prairie TX |
| UH | United Helicopter Corp, Palo Alto CA |
| UN | Universal Molded Products, Bristol VA |
| VE | Vega Aircraft Corp, Burbank CA |
| VI | Canadian Vickers, Montreal QUE |
| VL | Vertol Aircraft Corp, Morton PA |
| VN | Vultee Aircraft, Nashville TN |
| VO | Chance Vought Aircraft, Dallas TX |
| VU | Vultee Aircraft, Downey CA |
| VW | Vultee-Stinson Div, Consolidated-Vultee Aircraft Corp, Wayne MI |
| WA | Ward Furniture Co, Fort Smith AR |
| WI | Wichita Engineering, Wichita Falls TX |
| WO | Waco Aircraft Co, Troy OH |