Engine Company 21, also known as the Lanier Heights Firehouse, is a fire station or firehouse and a historic structure located in the Lanier Heights neighborhood in Washington, D.C.

The building is attributed to local architect Appleton P. Clark, Jr., and built in 1908 in the Spanish Colonial Revival style.

[2] The station was built to serve the growing suburban areas of Washington north of Florida Avenue, NW.

Because of its proximity to numerous multistory apartment buildings it housed the longest hook-and-ladder truck in the city.

This article about a property in the District of Columbia on the National Register of Historic Places is a stub.