20 Sector RAF is a former Royal Air Force Sector that was operational during both the First and the Second World Wars.

20th (Reserve) Wing RFC was formed on 25 July 1916 under the Middle East Brigade at Aboukir.

The wing was renamed to 20th (Training) Wing RFC on 31 May 1917 and was disbanded two years later on 22 July 1919.

84 Group RAF controlling: The wing moved to RAF Thorney Island on 9 April 1944 and was disbanded on 12 May 1944.

20 (Fighter) Sector was formed on 12 May 1944 at RAF Thorney Island controlling: The sector disbanded still at Thorney Island on 12 July 1944.