Williamstown is the primary village and a census-designated place (CDP) in the town of Williamstown, Orange County, Vermont, United States.

The CDP is in northwestern Orange County, in the north-central part of the town of Williamstown.

It is in the valley of the Stevens Branch of the Winooski River, part of the Lake Champlain watershed.

Vermont Route 14 passes through the village center, leading north 6 miles (10 km) to Barre and south through Williamstown Gulf 26 miles (42 km) to South Royalton in the White River Valley.

Vermont Route 64 leads west from Williamstown village 4 miles (6 km) to Interstate 89.