Harmonyville is an unincorporated community and census-designated place (CDP) in the town of Townshend, Windham County, Vermont, United States.

[2] The CDP is in north-central Windham County, in the southern part of the town of Townshend.

It is bordered to the north by the village of Townshend.

It sits in the valley of the West River, where it is joined from the northeast by Mill Brook.

Vermont Route 30 passes through the community, leading southeast 16 miles (26 km) to Brattleboro and northwest through Townshend village 30 miles (48 km) to Manchester Center.