Admiral of the Fleet Peter John Hill-Norton, Baron Hill-Norton, was a senior Royal Navy officer. He fought in the Second World War as gunnery officer in a cruiser operating on the Western Approaches and in the North Sea taking part in the Norwegian Campaign, then in a cruiser taking part in the Arctic convoys and finally in a battleship operating in the Eastern Fleet. After the War he commanded a destroyer and then an aircraft carrier. He served as First Sea Lord and Chief of the Naval Staff and then Chief of the Defence Staff in early 1970s. In the latter role he gave the final commitment to Project Chevaline, the Polaris missile improvement programme. He went on to be Chairman of the NATO Military Committee.

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.