Captain is the name most often given in English-speaking navies to the rank corresponding to command of the largest ships. The rank is equal to the army rank of colonel and air force rank of group captain.

The Bangladesh Navy is the naval warfare branch of the Bangladesh Armed Forces, responsible for the defence of Bangladesh's 118,813 square kilometres (45,874 sq mi) of maritime territorial area, and the security of sea ports and exclusive economic zones of Bangladesh. Bangladesh Navy protects the country's economic and military interests at home and abroad. The Bangladesh navy is also a front line disaster management force in Bangladesh, and participates in humanitarian missions abroad. It is a key regional player in counter terrorism efforts, and engages in global peacekeeping with the United Nations.