The Bridgewater Historic District is a historic district in Bridgewater, Pennsylvania, United States. Listed on the National Register of Historic Places on June 28, 1996, it includes buildings built between 1818 and 1933, although the most significant buildings in the district are those that were built before the Civil War in the 1860s. Located at the confluence of the Ohio and Beaver Rivers, Bridgewater was a transportation center as the terminus of the Bridgewater Canal during the pre-Civil War era. This prosperity is reflected in many of the district's buildings: the adjacent communities of Beaver and Rochester were less significant during that time, and accordingly have a much smaller number of period buildings.