Admiral of the Fleet Sir Peter Parker, 1st Baronet was a Royal Navy officer. As a junior officer, he was deployed with a squadron under Admiral Edward Vernon to the West Indies at the start of the War of Jenkins' Ear. He saw action again at the Battle of Toulon during the War of the Austrian Succession. As captain of the fourth-rate HMS Bristol he took part in the Invasion of Guadeloupe during the Seven Years' War.

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.