Quantico (/ˈkwɒntɪkoʊ/; formerly Potomac)[5] is a town in Prince William County, Virginia, United States.

The base is the site of the HMX-1 presidential helicopter squadron, the FBI Academy, the FBI Laboratory, the Marine Corps Combat Development Command, the Officer Candidates School, The Basic School, the United States Drug Enforcement Administration training academy, the Naval Criminal Investigative Service, the United States Army Criminal Investigation Division, and the Air Force Office of Special Investigations headquarters.

A replica of the United States Marine Corps War Memorial stands at one of the entrances to the base.

All road vehicles must pass through Marine Corps Base Quantico in order to reach the town.

[11] Amtrak's Northeast Regional and Piedmont services, as well as the local Virginia Railway Express, all stop at Quantico station.