No. 663 Squadron RAF (Polish: 663 Polski Szwadron Powietrznych Punktów Obserwacyjnych) was an Air Observation Post (AOP) unit of the Royal Air Force (RAF), manned with Polish Army personnel, which was officially formed in Italy on 14 August 1944. Numbers 651 to 663 Squadrons of the RAF were Air Observation Post units working closely with Army units in artillery spotting and liaison. A further three of these squadrons, 664–666, were manned with Canadian personnel. Their duties and squadron numbers were transferred to the Army with the formation of the Army Air Corps on 1 September 1957.