Admiral of the Fleet Sir Thomas John Cochrane was a Royal Navy officer. After serving as a junior officer during the French Revolutionary Wars, he captured the French ship Favourite off the coast of Dutch Guiana and then took part in various actions including the capture of the Virgin Islands from Danish forces, the capture of the French island of Martinique and the capture of the French archipelago of Îles des Saintes during the Napoleonic Wars. He also took part in the burning of Washington and the attack on Baltimore during the War of 1812.

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.