No. 657 Squadron AAC was a squadron of the British Army's Army Air Corps (AAC), part of the Joint Special Forces Aviation Wing based at RAF Odiham. The squadron disbanded in May 2018 after the retirement of the Westland Lynx.

The Army Air Corps (AAC) is the aviation arm of the British Army, first formed in 1942 during the Second World War by grouping the various airborne units of the British Army. Today, there are eight regiments of the AAC, as well as two independent flights and two independent squadrons deployed in support of British Army operations around the world. Regiments and flights are located in the United Kingdom, Kenya, and Canada. Some AAC squadrons provide the air assault elements of 16 Air Assault Brigade, through Joint Helicopter Command.