Non-British personnel in the RAF during the Battle of Britain

State of Origin	Number	Ref
Poland	145-146	[1][2][3]
New Zealand	127–135	[2][4]
Canada	112	[2]
Czechoslovakia	84–88	[2][5]
Belgium	28–30	[2][5]
Australia	26–32	[2][5]
South Africa	22–25	[2][5]
Free France	13–14	[2][5]
Republic of Ireland	10	[2]
United States	9–11	[2][5]
Southern Rhodesia	3–4	[2][5]
Barbados	1	[2]
Jamaica	1	[2]
Newfoundland	1	[2]
Northern Rhodesia	1	[5]

The Royal Air Force (RAF) and Fleet Air Arm had included personnel from outside the United Kingdom from before the beginning of the Second World War, and many served in the Battle of Britain in summer 1940. Many of these volunteers were British subjects—thus, citizens—coming from territories that made up part of the British Empire. Additionally, a significant part was made up of refugees and exiles from German-occupied Europe and American emigrants.

The RAF Roll of Honour recognises that 574 pilots, from countries other than the United Kingdom, as flying at least one authorized, operational sortie with an eligible unit during the period between 10 July to 31 October 1940, alongside 2,353 British pilots. The numbers differ slightly from the participants whose names are engraved on the Battle of Britain Monument in London, unveiled on 18 September 2005.

All pilots, regardless of nationality, who flew with British units during the Battle are known collectively, after a phrase coined by Winston Churchill, as "The Few".