Bridgewater is a borough in central Beaver County, Pennsylvania, United States, at the confluence of the Beaver and Ohio rivers. The population was 745 at the 2020 census. It is part of the Pittsburgh metropolitan area. The borough is best known as the home of the Bruster's Ice Cream chain. A few scenes in the 1986 movie Gung Ho were also shot in Bridgewater. Much of Bridgewater, including its two major streets, are included in the Bridgewater Historic District.

Beaver County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 168,215. Its county seat is Beaver, and its largest city is Aliquippa. The county is part of the Greater Pittsburgh region of the state.