Eskadra Myśliwska) was one of the fighter units of the Polish Army in 1939.

[1] In 1926, Lieutenant Pil, Bolesław Orliński and aircraft mechanic Leonard Kubiak of the squadron flew from Warsaw to Tokyo and back to Warsaw in 121 hours, covering 22,600 kilometres (14,000 mi) in a Bréguet 19 B.2.

[1] In August and September 1932, the Escadrille participated in air parades celebrating Poland's victory in the Challenge International de Tourisme 1932.

It participated in another air parade, celebrating Poland's victory in the Challenge International de Tourisme 1934.

In September 1939 the 121st Fighter Escadrille was attached to the Army Kraków.