Sir Guy Grantham, GCB, CBE, DSO (9 January 1900 – 8 September 1992) was a senior Royal Navy officer who served as Commander-in-Chief, Portsmouth from 1957 to 1959.

[2] Grantham served in the Second World War, initially as commander of the cruiser HMS Phoebe and was involved in the evacuation from Greece, for which he was awarded the Distinguished Service Order.

[1] After a period as a liaison officer in the Western Desert, he became Commander of the cruiser HMS Naiad, which was sunk by a torpedo in March 1942.

[1] He then became commander of the cruiser HMS Cleopatra, in which he was involved in the defeat of the Italian Fleet at the second Battle of Birte.

[1] His last wartime command was of the aircraft carrier HMS Indomitable, which was involved in the landings in Sicily.