Bridgewater is a town located in Plymouth County, in the state of Massachusetts, United States. As of the 2020 U.S. Census, the town's population was 28,633. Bridgewater is situated approximately 25 miles south of Boston and about 35 miles east of Providence, Rhode Island. This area was established as a part of Duxbury in 1645 by purchase from the Native Americans by 54 proprietors, most of whom did not settle there. Bridgewater was established as a Township on June 3, 1656, from Duxbury in Plymouth Colony. The town was placed in Plymouth County when counties were formed in 1685. For a brief time, the town was part of the Dominion of New England from 1686 to 1689. The township expanded by annexation between 1662 and 1798, and the town proper was bounded in 1846. Bridgewater is still in Plymouth County, though it was in limbo until the "Colony" was merged with Massachusetts Bay Colony in 1691, becoming the Commonwealth of Massachusetts.

According to the United States Census Bureau, the town has a total area of 28.2 square miles, of which 27.5 square miles is land and 0.7 square miles (2.62%) is water. Bridgewater is 99th out of the 351 communities in the Commonwealth of Massachusetts and eighth out of the twenty-seven municipalities in Plymouth County in terms of land area. The town is bordered by West Bridgewater to the northwest, East Bridgewater to the northeast, Halifax to the east, Middleborough to the south, and Raynham to the west. Bridgewater is approximately five miles south of Brockton, 10 miles northeast of Taunton, and 25 miles south of Boston, of which it is a suburb.