The title of Captain is the title given to an individual in control of a ship at sea, either pirate, marine, or civilian.

The rank of a marine officer who commands a ship would not necessarily be "Captain" (大佐 Taisa?)", it may be higher (up to Fleet Admiral), or, on small ships, lower. Any officer below the rank of Taisa who commands a ship, is addressed as "captain" while aboard that ship, by naval custom. The ship's captain also may be referred to as the Skipper.