St. Matthew's Church, also known as Addison Chapel, is a historic Episcopalchurch located at Seat Pleasant, Prince George's County, Maryland. Although the current chapel (the third on this site) was built about 1809, its simple Anglican styling reflects the Colonial-era, Church of England-influenced designs, of which few remain. Addison Chapel was first established in 1696 as a chapel of ease for St. John's at Broad Creek. The parish it serves was one of the thirty original Maryland parishes and was named for Colonel John Addison, of Oxon Hill plantation, a leading proponent of the Anglican Church. His descendant Walter Dulaney Addison, who was for a term Chaplain of the Senate also served as rector here. The church is a small one-story rectangular brick building laid in Flemish bond. It is associated with the Pinkney, Dulany, Addison, Lowndes, and Calvert families. St. Matthew's is situated in a large graveyard containing some early stones, the most notable being that of Benjamin Stoddert, the first Secretary of the Navy.