No. 627 Squadron was a Royal Air Force Mosquito aircraft pathfinder bomber squadron that operated during the Second World War
Low level target marking, developed by 617 Squadron, was so successful that 627 Squadron, a Mosquito unit in No 8 (PFF) Group, was "loaned" to 5 Group to operate in this role. The squadron arrived at Woodhall Spa on 14 April 1944 and stayed until the end of the war.

History
The squadron was formed on 12 November 1943 at RAF Oakington from part of 139 Squadron. It was equipped with the de Havilland Mosquito twin-engined fighter-bomber it flew operations as part of No. 8 Group's light bomber force. As well as normal bombing missions it also carried out Pathfinder duties and was involved in attacks on Berlin in early 1944. In April 1944 it was transferred to No. 5 Group as a specialised target marking squadron, although it also carried out armed reconnaissance and normal bombing duties. It was disbanded on 1 October 1945 at RAF Woodhall Spa when it was re-numbered 109 Squadron.