Y
- Yakovlev, Moskovskii Mashinostroitelnyy Zavod "Skorost" Imeni A. S. Yakovleva – Russia
- Yakovlev, Opytno-Konstruktorskoye Byuro Imeni A. S. Yakovleva OAO – Russia, (1927–present)
- Yakovlev, Yakovlev Aviatsionnoye Korporatsiya OAO – Russia
- Yakovlev, Yakovlev OKB – Russia, (1927–present)
- Yalo, Zaklad Naprawy i Budowy Sprzetu Latajacego Yalo SC – Poland
- Yanagisawa, Gen Yanagisawa Engineering System Co Ltd – Japan
- Yeoman, Yeoman Aircraft Pty Ltd – Australia, (1958–?)
- Yermolaev, Yermolaev OKB-240 – Soviet Union
- Yokosuka, Yokosuka Naval Arsenal – Japan