Granville Brothers Aircraft was an aircraft manufacturer from 1929 until its bankruptcy in 1934 that was located at the Springfield Airport in Springfield, Massachusetts. The Granville Brothers—Zantford, Thomas, Robert, Mark and Edward—are best known for the three Gee Bee Super Sportster racers, the Models Z, R-1 and R-2. Prior to building aircraft, Zantford ran a mobile aircraft repair service.

The Granville Gee Bee Model Z was an American racing aircraft that was built, successfully raced to victory, then destroyed in a deadly crash – all in 1931. It was the first of the Super Sportster aircraft built by Granville Brothers Aircraft of Springfield, Massachusetts, with the sole intent of winning the Thompson Trophy, which it did in September 1931. Its fatal crash that December started the reputation of subsequent Gee Bee aircraft as killers.