Groton is a town in Caledonia County, Vermont, United States.

It is bordered by the town of Peacham to the north, Barnet to the northeast, and Ryegate to the east, all in Caledonia County.

The highest point in Groton is 3,352-foot (1,022 m) Signal Mountain, near the southwest corner of the town.

The CDP of Groton is the primary settlement in the town, located in the southeastern corner along US 302 and the Wells River.

There were 338 households, out of which 35.8% had children under the age of 18 living with them, 61.8% were couples living together and joined in either marriage or civil union, 9.5% had a female householder with no husband present, and 25.4% were non-families.

20.1% of all households were made up of individuals, and 9.8% had someone living alone who was 65 years of age or older.

Activities in the parks include hiking, camping, fishing, swimming, boating, picnicking, snowshoeing and cross country skiing.