Police commissioner is a senior rank in many police forces of the world. In other jurisdictions, it is the title of a member of an oversight board.

A chief of police (COP) is the title given to an appointed official or an elected one in the chain of command of a police department, particularly in North America. A chief of police may also be known as a police chief or sometimes just a chief, while some countries favour other titles such as commissioner or chief constable. A police chief is appointed by and answerable to a state or local government.