No. 651 Squadron Army Air Corps, is an aircraft squadron of the British Army, originally formed as No. 651 Squadron Royal Air Force in Italy and North Africa during the Second World War, and afterwards in Egypt. Numbers 651 to 663 Squadrons of the RAF were air observation post units which had both Army and RAF personnel. The pilots, drivers and signallers were in the Royal Artillery whilst the adjutants, technical staff and equipment officers came from the RAF. Air observation posts were used primarily for artillery spotting, but occasionally for liaison and other duties. Their duties and squadron numbers were transferred to the Army with the formation of the Army Air Corps on 1 September 1957.

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.