Barre is a town in Worcester County, Massachusetts, United States. The population was 5,398 at the 2010 census.

Originally called the Northwest District of Rutland, it was first settled in 1720. The town was incorporated on June 17, 1774, as Hutchinson after Thomas Hutchinson, colonial governor of Massachusetts. But on November 7, 1776, it was renamed Barre in honor of Isaac Barré, a champion of the American Colonies.

According to the United States Census Bureau, the town has a total area of 44.6 square miles (116 km²), of which 44.3 square miles (115 km²) is land and 0.3 square miles (0.78 km²), or 0.63%, is water. Barre is drained by the Ware River.

Barre is bordered by Hubbardston to the northeast, Rutland and Oakham to the southeast, New Braintree to the south, Hardwick to the southwest, Petersham to the northwest, and a small portion of Phillipston to the north.

As of the census of 2000, there are 5,113 people, 1,889 households, and 1,377 families residing in the town. The population density is 115.3 people per square mile (44.5/km²). There are 1,988 housing units at an average density of 44.8 per square mile (17.3/km²). The racial makeup of the town is 97.63% White, 0.51% Black or African American, 0.10% Native American, 0.33% Asian, 0.29% from other races, and 1.13% from two or more races. 0.80% of the population are Hispanic or Latino of any race.

Massachusetts (ⁱ/ˌmæsəˈtʃuːsɨts/), officially the Commonwealth of Massachusetts, is a U.S. state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. Massachusetts is the 7th least extensive, but the 14th most populous and the 3rd most densely populated of the 50 United States. The state features two separate metropolitan areas – the eastern Boston metropolitan area and the western Springfield metropolitan area. Approximately two thirds of the state's population lives in Greater Boston, most of which is either urban or suburban. Western Massachusetts features one urban area – the Knowledge Corridor along the Connecticut River – and a mix of college towns and rural areas. Massachusetts is the most populous of the six New England states and has the US's sixth highest GDP per capita.