Frank Rushmore Watson (1859–1940) was a Philadelphia architect specializing in church architecture who was born and raised in the Frankford Neighborhood of Philadelphia.
His designs are up and down the eastern seaboard. Some of his most notable work include St. Mark's Church, Frankford in Philadelphia, Christ and St. Luke, Norfolk, Virginia, and Gideon F. Egner Chapel at Muhlenberg College, Pennsylvania. With Samuel Huckel, Jr. he designed Worcester Union Station in Massachusetts.