40 Squadron, No. 40 Squadron or 40th Squadron may refer to:
No. 40 Squadron RAAF, a unit of the Australian Air Force 40th Squadron Heli (Belgium), a unit of the Belgian Air Force No. 40 Squadron RNZAF, a unit of the Royal New Zealand Air Force 40th Tactical Squadron, a unit of the Polish Air Force No. 40 Squadron SAAF, a unit of the South African Air Force No. 40 Squadron RAF, a unit of the United Kingdom Royal Air Force 40th Flight Test Squadron, a unit of the United States Air Force 40th Airlift Squadron, a unit of the United States Air Force
See also 40th Division (disambiguation) 40th Brigade (disambiguation) 40th Regiment (disambiguation) 40th Battalion (disambiguation)