Thomas Covered Bridge in Armstrong Township, Indiana County, Pennsylvania, is a historic wooden bridge built in 1879 to carry a road over Crooked Creek. It is one of four surviving covered bridges in the county and features a 52-foot Town truss span, a common 19th-century design that used a timber lattice to provide strength through relatively simple construction. Its listing on the National Register of Historic Places in 1979 recognized both its age and its significance as one of the few covered bridges still standing in the area.