Admiral of the Fleet Michael Cecil Boyce, Baron Boyce, was a British Royal Navy officer who also sat as a crossbench member of the House of Lords until his death in November 2022.

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.