D
- DAC, Dutch Aeroplane Company VOF – Netherlands
- Damoure-Fabre, Damoure et Fabre – France
- D'Apuzzo, Nicholas E. D'Apuzzo – United States
- DAR (1), Aeroplanes DAR Ltd – Bulgaria, (1995–present)
- DAR (2), Darjawna Aeroplanna Rabotilniza – Bulgaria, (1924–1945)
- 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) – Russia
- 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