Polikarpov DI-1

DI-1 (2I-N1)
Role	Fighter Type of aircraft
National origin	Soviet Union
Manufacturer	Polikarpov
Designer	Nikolai Nikolaevich Polikarpov
First flight	12 January 1926
Status	Cancelled
Number built	1

The Polikarpov DI-1 (DI - Dvukhmesnyy Istrebitel - two-seat fighter), also known as 2I-N1, Russian: Поликарпов ДИ-1 (2И-Н1), was a prototype Soviet two-seat fighter designed during the 1920s. The sole prototype built crashed on its ninth flight, due to manufacturing defects, and the program was cancelled.