Gustav Otto Flugmaschinenfabrik was a pioneering German aircraft producer during the early part of the 20th century. Founded in 1910 by Gustav Otto in Bavaria, the firm was reorganized on 7 March 1916 into Bayerische Flugzeugwerke (BFW). In 1917, a Bavarian aircraft engine maker called Rapp Motorenwerke changed its name to Bayerische Motoren Werke GmbH (BMW). That company transferred its engine-production assets and the BMW name in 1922 to Bayerische Flugzeugwerke, which was then renamed to Bayerische Motoren Werke AG and subsequently evolved into the automotive and motorcycle manufacturer that is now known as BMW.

Gustav Otto was a German aircraft and aircraft engine designer and manufacturer.