No. 222 Squadron was a Royal Air Force fighter unit.
The squadron was formally formed at Thasos on 1 April 1918 from "A" Squadron of the former No. 2 Wing, RNAS when the Royal Air Force was formed. At this time, Richard Peirse became Officer Commanding 222 Squadron. Later, on 6 April 1918, former "Z" Squadron of No. 2 Wing, RNAS was added to the strength. Renumbered No. 62 Wing and consisting of Nos. 478, 479 and 480 Flights, the squadron was given the task of maintaining raids on Turkish targets in Macedonia and Thrace, operating from islands in the Northern Aegean, officially adopting the 222 Squadron number plate on 14 September 1918. The squadron continued to carry out raids on Turkish targets in the Balkans until the end of the war, eventually disbanding on 27 February 1919.
On 5 October 1939 No. 222 Squadron was reformed at RAF Duxford flying Blenheim Mk.If's in the shipping protection role, but in March of the following year it re-equipped with Spitfires and became a day-fighter unit. It fought during the Battle of Britain, being based at RAF Hornchurch on 15 September 1940, under Squadron Leader "Johnnie" Hill. It later took part in Operation Jubilee, the 1942 Dieppe raid. In December 1944 the squadron converted to Tempests, which it flew till the squadron was recalled to the UK to re-equip with Meteors.