The Old Mill Road Bridge is a historic bridge near Rocky Ridge, Frederick County, Maryland, United States. The bridge spans Owens Creek southwest of Rocky Ridge on Old Mill Road. It is a Pratt half-hip through truss structure in a single span long and . It was built in 1882 by the Pittsburgh Bridge Company, Pittsburgh, Pennsylvania.
The Old Mill Road Bridge was listed on the National Register of Historic Places in 1979.
See also
List of bridges documented by the Historic American Engineering Record in Maryland List of bridges on the National Register of Historic Places in Maryland