Saint Stephen Martyr Catholic Church, Catholic church building on Pennsylvania Avenue, Washington D.C., United States.

Saint Stephen Martyr Catholic Church is a brick and stone Catholic church on Pennsylvania Avenue in downtown Washington, D.C., with a separate bell tower that stands apart from the main building. The interior is designed to seat a large congregation, with a broad nave and seating arranged to face the altar.

Archbishop Martin John Spalding proposed a new parish for Washington's west end in 1865; land at 24th Street and Pennsylvania Avenue was bought for $8,575 and the cornerstone of Adolf Cluss's red brick church laid on June 3, 1866. The parish was established on August 4, 1867, with Rev. John McNally as first pastor, and the church was consecrated on December 27, 1868. It closed on July 15, 1959, and the present building was consecrated on June 11, 1961.

The parish was founded in 1867 as the ninth Roman Catholic parish in Washington. Its first pastor, Rev. John McNally, served for 22 years until his death in 1889. His successor, Father John Gloyd, collected old gold and silver jewelry from parishioners and had it melted down into a solid gold chalice and a silver-gilt chalice.

The church is easy to find on Pennsylvania Avenue in downtown Washington, within walking distance of several Metro stops. If you want to look inside, it is best to come outside of service times so as not to disturb the congregation.

The parish's first church was designed by Adolf Cluss, one of the most important architects working in the District of Columbia in the mid-1800s. The original red brick church and rectory together cost about $51,425, and the altar was not finished until February 1869, after the church had already been consecrated.