The Polikarpov I-17 was a Soviet single-seat fighter prototype designed and built by a team headed by Nikolai Polikarpov at the Central Design Bureau (TsKB) in 1934.

The second prototype designated the TsKB-19 had a revised inward retracting wide-track main landing gear and a Soviet M-100 engine.

This second prototype was displayed at the 1936 Salon de l'Aeronautique in Paris.

The third prototype designated the TsKB-33 had reduced armament to save weight and a revised engine cooling system, but the further development was abandoned in 1936.

One I-17 prototype is on display at the V. P. Chkalov Memorial Museum in Chkalovsk, Russia.