Admiral of the Fleet Sir Frederick Laurence Field, was a senior Royal Navy officer. He served in the Boxer Rebellion as commander of a raiding party and in the First World War as commanding officer of the battleship HMS King George V, flagship of Admiral Martyn Jerram at the Battle of Jutland in May 1916. He went on to be Commander-in-Chief, Mediterranean Fleet before serving as First Sea Lord during the early 1930s, in which role he dealt with the response to the Invergordon Mutiny in September 1931 and ensured the abandonment in 1932 of the 'ten-year rule', an attempt by the treasury to control defence expenditure by requesting the Foreign Office to declare whether there was any risk of war during the next ten years.

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.