The Polish Air Forces was the name of the Polish Air Forces formed in France and the United Kingdom during World War II. The core of the Polish air units fighting alongside the Allies were experienced veterans of the 1939 invasion of Poland. They contributed to the Allied victory in the Battle of Britain and Allied air operations during the war.

The Polish Fighter Squadron, 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 with the allied armies.