Admiral Sir William Gerrard Andrewes KBE CB DSO (3 November 1899 – 21 November 1974) was a Royal Navy officer who served in World War I and World War II, commanded the British and Commonwealth Naval Forces and Task Force 91[1] (part of the Joint Task Force 7, UN Combined Fleet) for the Inchon Landing during the Korean War, and went on to command of the America and West Indies Squadron and served as Deputy Supreme Allied Commander, Atlantic.

After a tactical course at Portsmouth, he served as Executive Officer of the battleship Rodney in the Home Fleet from 26 July 1937 until receiving promotion to the rank of captain on 30 June 1938.

On 8 April 1940 he was appointed assistant director of the Plans Division at the Admiralty, not returning to sea duty until 19 September 1942 when he took command of the cruiser Uganda for service in the Atlantic and Mediterranean, taking part in "Operation Husky", the Allied invasion of Sicily, in July–August 1943, (for which he received a Mention in Despatches) and in "Operation Avalanche", the landings at Salerno, in September 1943 (for which he was awarded the Distinguished Service Order).

[2] On 28 February 1944 he was appointed Deputy Chief of Staff to the Commander-in-Chief, Portsmouth, for administration and duties in preparation for the Normandy landings, with the rank of commodore, 2nd class.

In December 1947 he was appointed Senior Naval Member of the Directing Staff of the Imperial Defence College, and was promoted to rear admiral on 8 January 1948.

[2] From 15 October 1951 he served as Commander-in-Chief of the America and West Indies Station, and also as Deputy Supreme Allied Commander, Atlantic (DSACLANT), from 1952 to 1953.

[2] Admiral Andrewes retired on 10 January 1957, and became a director of the shipbuilders John I. Thornycroft & Company having become a member of the Institution of Electrical Engineers in May 1956.