Tenleytown–AU station is a subway station on the Red Line of the Washington Metro in Washington, D.C. Located in the Upper Northwest neighborhood, it is the last station on the Red Line heading outbound wholly within the District of Columbia; the next stop, Friendship Heights, lies within both the District and the state of Maryland. The station serves American University (AU).

The Red Line is a rapid transit line of the Washington Metro system, consisting of 27 stations in Montgomery County, Maryland, and Washington, D.C., in the United States. It is a primary line through downtown Washington and the oldest and busiest line in the system. It forms a long, narrow "U," capped by its terminal stations at Shady Grove and Glenmont.