The Kellett Autogiro Corporation was an American aircraft manufacturer from 1929 based in Philadelphia, named after founder W. Wallace Kellett.

In 1931, Kellett Autogiro licensed, from the Autogiro Company of America, Juan de la Cierva's and Harold Pitcairn's patents for rotary-wing aircraft.

The KD-1/G-1 was the first practical rotary-wing aircraft used by the United States Army.

The company stopped building autogyros in the late 1940s and switched to the design of helicopters.

In the 1950s it built some ultra-light helicopters the RH-1 to test some rotor features and its last design the K-25 was an experimental convertiplane using tilt-rotors.