Royal Air Force Thorney Island, or more simply RAF Thorney Island, is a former Royal Air Force station located on Thorney Island, West Sussex, England, 6.6 miles (10.6 km) west of Chichester and 7.1 miles (11.4 km) east of Portsmouth, Hampshire.

Thorney Island is an island that juts into Chichester Harbour in West Sussex. It is separated from the mainland by a narrow channel called the Great Deep.