Harmon's Covered Bridge is a historic wooden bridge in Washington Township, Indiana County, Pennsylvania. Built in 1910, it uses the town truss form and crosses the South Branch Plum Creek. Though only 41 feet long, it stands as a surviving example of the once-common covered bridges that served rural communities and have largely vanished. Its rarity gives it added significance, as it is one of just four covered bridges still remaining in Indiana County. That importance was formally recognized with its listing on the National Register of Historic Places in 1979.