Trinity Episcopal Church was an Episcopal church that stood from 1851 to 1936 on the northeast corner of 3rd and C Streets NW in the Judiciary Square neighborhood of Washington, D.C. Founded in 1827, the parish was home to prominent attendees including President John Quincy Adams, Senator Daniel Webster, and Francis Scott Key, who served as the church's senior warden. The first church building was located on 5th Street NW, across the street from District of Columbia City Hall, in what was then a fashionable area of the city. The parish grew and began planning a new church building. With financial assistance from William Wilson Corcoran, the parish bought the lot with which the church is best associated, and a cornerstone was laid in 1850.