Admiral of the Fleet Sir John Michael de Robeck, 1st Baronet, was an officer in the Royal Navy. In the early years of the 20th century he served as Admiral of Patrols, commanding four flotillas of destroyers.

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.