Scotland Yard (officially New Scotland Yard) is the headquarters of the Metropolitan Police, the territorial police force responsible for policing Greater London's 32 boroughs, but not the City of London, the square mile that forms London's historic and primary financial centre. Its name derives from the location of the original Metropolitan Police headquarters at 4 Whitehall Place, which also had an entrance on a street called Great Scotland Yard. The Scotland Yard entrance became the public entrance, and over time "Scotland Yard" has come to be used not only as the name of the headquarters building, but also as a metonym for both the Metropolitan Police Service itself and police officers, especially detectives, who serve in it. The New York Times wrote in 1964 that, just as Wall Street gave its name to New York's financial district, Scotland Yard became the name for police activity in London.

The force moved from Great Scotland Yard in 1890, to a newly completed building on the Victoria Embankment, and the name "New Scotland Yard" was adopted for the new headquarters. An adjacent building was completed in 1906. A third building was added in 1940. In 1967, the Metropolitan Police Service (MPS) consolidated its headquarters from the three-building complex to a tall, newly constructed building on Broadway in nearby Victoria. In summer 2013, it was announced that the force would move to Westminster's Curtis Green Building, which was once again renamed "New Scotland Yard." In November 2016, MPS moved to its present headquarters, which continues to bear the name "New Scotland Yard," the fourth location to do so.