Wareham (WAIR-ham) is a town in Plymouth County, Massachusetts, United States. As of the 2010 census, the town had a population of 21,822.
Wareham was first settled in 1678 by Europeans as part of the towns of Plymouth and Rochester. It was officially incorporated in 1739 and named after the town of Wareham in England. Because of its geography, Wareham's early industry revolved around shipbuilding and the related industries. It also served as a resort town, with many smaller resorts scattered around the town, especially in Onset. Like Sandwich, its waterways, especially Buttermilk Bay, were considered as possible pathways for the Cape Cod Canal. Although the canal proper goes through Bourne and Sandwich, the southern approach to Buzzards Bay passes just south of the peninsulas that make up the topography of the town.
Wareham is home of the Tremont Nail Factory, the oldest nail manufacturer in the United States. The factory was established in 1819.
According to the United States Census Bureau, the town has a total area of 46.3 square miles (120 km2), of which 35.8 square miles (93 km2) is land and 10.5 square miles (27 km2) is water.