Metropolitan Police is a generic title for the municipal police force for a major metropolitan area, and it may be part of the official title of the force. They provide all general police services and tend to be headed by a chief called a Commissioner or Sheriff.

The Metropolitan Police Service (abbreviated to MPS and widely known informally as "the Met") is the territorial police force responsible for law enforcement in Greater London, excluding the "square mile" of the City of London, which is the responsibility of the City of London Police. The Met also has significant national responsibilities, such as co-ordinating and leading on counter-terrorism matters and protection of the British Royal Family and senior figures of Her Majesty's Government.