St. Luke's Episcopal Church is a historic Episcopal church located at 1514 15th Street, N.W., in Washington, D.C. Completed in 1879, it is home to the oldest African-American Episcopal congregation in the city. It was designated a U.S. National Historic Landmark in 1976 for its association with Rev. Alexander Crummell (1819–1898), a leading figure advocating black self-sufficiency and civil rights in the mid-19th century.