754 Naval Air Squadron was a Naval Air Squadron of the Royal Navy's Fleet Air Arm. It was active as an Observer Training Squadron from 1939 to 1944 as part of No. 2 Observer School, forming out of the School of Naval Co-operation RAF, in May 1939. It initially operated out of HMS Daedalus, RNAS Lee-on-Solent, Hampshire, however, after the Naval Air Station was attacked and bombed, it then moved to north to HMS Condor, RNAS Arbroath, Angus, Scotland, in September 1940. Here, it provided training for Observers and also Air Gunners and where four years later, in March 1944, it disbanded. The squadron then briefly reformed as a Air Gunner Training Squadron, as part of No. 1 Naval Air Gunners School, when 744 Naval Air Squadron was re-designated 754 Naval Air Squadron, in June 1944, at RN Air Section Yarmouth, Nova Scotia, Canada, until disbanding again, in March 1945.

744 Naval Air Squadron is a Naval Air Squadron of the Royal Navy's Fleet Air Arm. It was initially active in 1943, based in Nova Scotia. A second 744 NAS was formed, in early 1944, in Northern Ireland, for Merchant Aircraft Carrier training, meaning the first iteration was re-designated 754 NAS. The squadron's primary focus turned to Anti-submarine warfare training, which then further developed into trialing new submarine detection technology, ending in 1956. In 2018 it reformed as the Mission Systems and Armament Test and Evaluation Squadron.