Royal Air Force Selsey or more simply RAF Selsey is a former Royal Air Force Advanced Landing Ground located 2 miles north east of Selsey, West Sussex and 5 miles south of Chichester, West Sussex, England.

The following units were here at some point:

• No. 121 Airfield RAF
  • No. 65 Squadron RAF (1943)
  • No. 245 Squadron RAF (1943)
• No. 135 Airfield RAF (renamed No. 135 (Fighter) Wing RAF on 15 May 1944)
  • No. 222 Squadron RAF (1944)
  • No. 349 (Belgian) Squadron RAF (1944)
  • No. 485 Squadron RNZAF (1944)
• No. 145 (French) (Fighter) Wing RAF
  • No. 329 Squadron RAF (1944)
  • No. 340 Squadron RAF (1944)
  • No. 341 Squadron RAF (1944)
• No. 33 Squadron RAF (1944)
• No. 74 Squadron RAF (1944)
• No. 131 Airfield (Polish) RAF
• No. 421 Repair & Salvage Unit
• No. 1316 Mobile Wing RAF Regiment
• No. 2731 Squadron RAF Regiment
• No. 2800 Squadron RAF Regiment
• No. 2955 Squadron RAF Regiment

• Ashworth, C (1985). Action Stations: Vol 9. Military airfields of the Central South and South-East. Wellingborough: Patrick Stephens Limited. ISBN 0-85059-608-4.
• Falconer, J (1998). RAF Fighter Airfields of World War 2. UK: Ian Allan Publishing. ISBN 0-7110-2175-9.
• Jefford, C.G. (1988). RAF Squadrons. A comprehensive record of the movement and equipment of all RAF squadrons and their antecedents since 1912. Shrewsbury: Airlife. ISBN 1-85310-053-6.