HMS Southdown was a Type I Hunt-class destroyer of the Royal Navy which served in World War II.

Southdown was ordered on 11 April 1939 under the 1939 War Emergency Build Programme as job number J6602.

She earned battle honours during the Second World War for the North Sea 1941–1945, where she spent the majority of her service.

In June 1944 she formed part of the Naval escort force in support of the Normandy Landings.

Following the war she was converted for use as an air target ship at Rosyth in September 1945.