Admiral of the Fleet Andrew Browne Cunningham, 1st Viscount Cunningham of Hyndhope, was a British officer of the Royal Navy during the Second World War. He was widely known by his initials, "ABC".

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.