Old Bridge, also known as the Historic Village of Old Bridge, is an unincorporated community located within East Brunswick in Middlesex County, New Jersey. It is on the South River, a tributary of the Raritan River. The community is named after the first bridge built here to cross the river, the South River Bridge. After other bridges were built crossing the river, it became known as the Old Bridge. The Old Bridge Historic District, encompassing much of the village, is listed on the state and national registers of historic places.