The Metropolitan Police Department of the District of Columbia (MPDC), more commonly known as the Metropolitan Police Department (MPD), the DC Police, and, colloquially, the DCPD, is the primary law enforcement agency for the District of Columbia, in the United States. With approximately 3,400 officers and 600 civilian staff, it is the sixth-largest municipal police department in the United States. The department serves an area of 68 square miles (180 km2) and a population of over 700,000 people. Established on August 6, 1861, the MPD is one of the oldest police departments in the United States. The MPD headquarters is at the Henry J. Daly Building, located on Indiana Avenue in Judiciary Square across the street from the District of Columbia Court of Appeals and the Superior Court of the District of Columbia. The department's mission is to "safeguard the District of Columbia and protect its residents and visitors with the highest regard for the sanctity of human life". The MPD's regulations are compiled in title 5, chapter 1 of the District of Columbia Code.

The Henry J. Daly Building is located at 300 Indiana Avenue, NW, and 301 C Street, NW, in the Judiciary Square neighborhood of Washington, D.C., United States. The administrative building is owned by the government of the District of Columbia and has served as the home of various city offices since it opened in 1941 as a unified location for previously dispersed municipal functions. Currently, the building is primarily occupied by the Metropolitan Police Department; although the District of Columbia Department of Corrections, the District of Columbia Office of the Chief Financial Officer and the Court Services and Offender Supervision Agency (CSOSA) also maintain offices in the building.