W
- 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