749 Naval Air Squadron was a Naval Air Squadron of the Royal Navy's Fleet Air Arm. It was active from 1941 through to 1945, formed as an Observer Training Squadron, as part of No.1 Observer School at RNAS Piarco ]], located 30 km (19 mi) east of Downtown Port of Spain, adjacent to the town of Piarco, on the island of Trinidad.

The Royal Navy Observer School grew out of HM Naval Seaplane Training School at RNAS Lee-on-Solent as a result of a series of changes of identity and parent unit. From 1918 until 1939 the Royal Air Force was responsible for naval aviation, including training and provision of aircrew to the Royal Navy. With the return of naval aviation to the Royal Navy on 24 May 1939, the Observer School was established as 750 Naval Air Squadron of the Fleet Air Arm. During World War II the squadron moved to Trinidad to continue training aircrew. It was temporarily disbanded in October 1945. The squadron reformed in 1952 and is currently based at RNAS Culdrose, where it trains approximately 30 Royal Navy observers every year.