Admiral of the Fleet Sir Charles Morton Forbes, was a Royal Navy officer. He served in the First World War, seeing action in the Dardanelles campaign and at the Battle of Jutland and, as captain of a cruiser, was present at the surrender of the German fleet. During the Second World War, he served as Commander-in-Chief, Home Fleet: his fleet suffered heavy losses including the aircraft carrier HMS Glorious and nine destroyers during the Norwegian campaign in Spring 1940. He went on to be Commander-in-Chief, Plymouth in May 1941 and in that capacity he organised the defence of Plymouth from air attack, prosecuted attacks on enemy shipping using the harbour at Brest as well as other ports along the French coast, and also initiated the St Nazaire Raid in March 1942 before retiring in August 1943.

Admiral of the Fleet is a five-star naval officer rank and the highest rank of the Royal Navy, formally established in 1688. The five-star NATO rank code is OF-10, equivalent to a field marshal in the British Army or a Marshal of the Royal Air Force. Apart from honorary appointments, no new admirals of the fleet have been named since 1995, and no honorary appointments have been made since 2014.