Admiral of the Fleet Sir William Bowles, KCB was a senior Royal Navy officer and Conservative Party politician. After serving as a junior officer in the French Revolutionary Wars, he became commanding officer of the sloop HMS Zebra and took part in the bombardment of Copenhagen in September 1807 during the Napoleonic Wars. As commanding officer of the fifth-rate HMS Medusa, he took part in operations off the north coast of Spain and led a naval brigade in a raid on Santoña.

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.