* Canada: The Royal Canadian Air Force (RCAF) provided fighter squadrons and pilots to assist in the defense of Britain against German air attacks. RCAF squadrons were responsible for shooting down over 200 German aircraft during the Battle of Britain.
* Poland: The Polish Air Force also played a significant role in the Battle of Britain. Polish pilots were credited with shooting down over 170 German aircraft during the battle.
* Czechoslovakia: Czechoslovakia also sent pilots to fight alongside the British in the Battle of Britain. Czechoslovak pilots were responsible for shooting down over 100 German aircraft during the battle.
* New Zealand: The Royal New Zealand Air Force (RNZAF) also contributed to the Battle of Britain. RNZAF squadrons were responsible for shooting down over 80 German aircraft during the battle.
* Australia: The Royal Australian Air Force (RAAF) also sent pilots to fight alongside the British in the Battle of Britain. RAAF pilots were responsible for shooting down over 60 German aircraft during the battle.
* United States: Although the United States did not officially declare war on Germany until December 1941, they provided some military assistance to Britain during the Battle of Britain. American pilots flew with British squadrons and American aircraft were sold to Britain.
In addition to these countries, Britain also received support from a number of other countries, including France, Belgium, the Netherlands, Norway, and Denmark. These countries all had pilots who flew with British squadrons during the Battle of Britain.