The Polish Fighter Squadron (Polish: I/145 Polski Dywizjon Myśliwski, French: Groupe de Chasse Polonais), also known by its designation GC I/145, was the largest fighter unit of the Polish Air Forces in France. Formed of Polish pilots who evaded capture by the Nazis and the Soviets in the aftermath of the Invasion of Poland of 1939, the unit was initially earmarked to be sent to Finland as part of the aborted plan of Allied intervention in the Winter War. Eventually it took part in the Battle of France defending the French skies along the allied armies.