No. 31 Squadron is a Royal Australian Air Force (RAAF) airbase support squadron. It was formed in August 1942 and disbanded in July 1946 after seeing action against the Japanese in the South West Pacific theatre of World War II. During the war, it operated the Bristol Beaufighter, which it operated in long-range fighter and ground-attack missions. The squadron was re-raised for its current role in July 2010.

The Bristol Type 156 Beaufighter is a British multi-role aircraft developed during the Second World War by the Bristol Aeroplane Company. It was originally conceived as a heavy fighter variant of the Bristol Beaufort torpedo bomber. The Beaufighter proved to be an effective night fighter, which came into service with the Royal Air Force (RAF) during the Battle of Britain, its large size allowing it to carry heavy armament and early airborne interception radar without major performance penalties.