Gunner, in the Royal Navy, a warrant officer whose duty it is to take charge of a ship's guns and ordnance stores. He receives, according to his seniority or temporary position, from 5s. 6d. to 8s. 3d. a day, and he may be promoted to the rank of chief gunner, with pay at 9s. a day. A gunner's mate is a petty officer appointed to assist a gunner.