Admiral Sir Ralph Leatham, KCB (3 March 1888 – 10 March 1954) was a Royal Navy officer who served as Commander-in-Chief, Plymouth during World War II.

Leatham joined the Royal Navy in 1900 as a cadet on the training ship Britannia.

[1] He was appointed Commander of the 1st Battle Squadron on 14 June 1938 holding that post until February 1939.

[1] He served in World War II as Commander-in-Chief, East Indies Station from 12 April 1939 until 16 July 1941.

He was next appointed as Admiral Superintendent Malta Dockyard and Flag Officer in Charge, Malta from January 1942 taking part in actions against the Italian Navy until December 1942.