The Church of the Ascension and Saint Agnes is an Episcopal church building located at 1215 Massachusetts Avenue in Northwest Washington, D.C., USA. The current structure built in 1874 as the Church of the Ascension was added to the National Register of Historic Places in 1984. In the late 1940s, the Church of the Ascension merged with the nearby St. Agnes Episcopal Church and adopted its present name, under which it has continued as an active parish in the Episcopal Diocese of Washington.