Admiral of the Fleet Sir Nowell Salmon, was a Royal Navy officer. As a junior officer he served in the naval brigade and took part in the Siege of Lucknow during the Indian Mutiny. He was a member of the force defending the Residency when he volunteered to climb a tree near the wall of the Shah Nujeff mosque to observe the fall of shot, despite being under fire himself and wounded in the thigh. He and his colleague, Leading Seaman John Harrison, were awarded the Victoria Cross, the highest award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces for this action.

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.