The Avro Anson is a British twin-engine, multi-role aircraft that served with the Royal Air Force, Fleet Air Arm, Royal Canadian Air Force and numerous other air forces before, during, and after the Second World War. Named after British Admiral George Anson, it was originally designed as an airliner as the Avro 652 before being redeveloped for maritime reconnaissance, but was soon rendered obsolete in both roles. However, it was rescued from obscurity by its suitability as a multi-engine air crew trainer, becoming the mainstay of the British Commonwealth Air Training Plan. By the end of production in 1952, the Anson spanned nine variants; a total of 8,138 were built in Britain by Avro. From 1941, a further 2,882 were built by Federal Aircraft Ltd. in Canada.
The Anson was derived from the commercial six-seat 652 model; the militarised version, which first flew on 24 March 1935, was built to Air Ministry Specification 18/35. It was the first RAF monoplane with a retractable undercarriage. Avro allotted the type number 652A to the Anson. The first production run resulted in 174 Mk I aircraft for service with Coastal Command. No. 48 Squadron RAF was the first to be equipped in March 1936.
A total of 11,020 Ansons were built by the end of production in 1952, making it the second-most-numerous (after the Vickers Wellington), British multi-engine aircraft of the war.