Church of St. Thomas the Apostle is a historic church at 822 E. Grand Avenue in Beloit, Wisconsin, United States. It was built in 1885 and was added to the National Register of Historic Places in 1983. Inside, the auditorium is 118 feet long and fifty-five feet wide, with an arcade of stained glass windows. Behind the altar is another large, elaborate stained glass window. The ceiling is supported by wooden trusses. The church was built by masons Marshall and Sweet, carpenters Cummingham Brothers, and stonecutter A.S. Jackson, all from Beloit.