l'Enfant Plaza is a Washington Metro station in the Southwest Federal Center neighborhood of Washington, D.C., United States. The station was opened on July 1, 1977, and is operated by the Washington Metropolitan Area Transit Authority (WMATA). It is a transfer station, with service for both the Blue and Orange Lines provided on an island platform on the lower level, and for both the Green and Yellow Lines provided on a pair of side platforms on the upper level. It is also where the Yellow and Green lines converge going north. It is the only station in the system to be served by four lines. Only the Red Line does not serve the station.

The station is located in Southwest Washington, with entrances at the l'Enfant Plaza shopping mall concourse at 9th and D Streets, on D Street between 6th and 7th Streets, at Maryland Avenue and 7th Street, and in the courtyard of the former United States Department of Transportation building. It is in the center of an area crowded with federal buildings, and is a transfer point allowing passengers to easily cross the Potomac between Virginia and central Washington, making it a very busy station. l'Enfant Plaza is named for the French-American planner of Washington, D.C., Pierre (Peter) Charles L’Enfant.