Royal Naval Air Station Yeovilton, commonly referred to as RNAS Yeovilton, (IATA: YEO, ICAO: EGDY) (HMS Heron) is an airbase of the Royal Navy, sited a few miles north of Yeovil, in the English county of Somerset. It is one of two active Fleet Air Arm bases, the other being RNAS Culdrose. RNAS Yeovilton is currently home to the Royal Navy Wildcat HMA2, along with Army Air Corps Wildcat AH1 helicopters, as well as the Royal Navy's Commando Helicopter Force Merlin HCi3/4/4A and Wildcat AH1 helicopters.

The site consists of 1,000 acres (1.6 square miles; 4.0 square kilometres) of airfield sites, plus ranges and minor estates. Royal Naval Air Station (RNAS) Yeovilton is a large multi-role air station, with an annual budget of some £61 million. The airfield is also home to the Fleet Air Arm Museum, and until 2019 the station hosted an annual Air Day in July.