Londonderry is a town in Windham County, Vermont, United States. It is bounded on the north by Landgrove and Weston, on the east by Windham, on the south by Jamaica and on the west by Winhall and Landgrove. The population was 1,919 in the 2020 census. The town contains the villages of Londonderry and South Londonderry.

Windham County is a county located in the U.S. state of Vermont. As of the 2020 census, the population was 45,905. The shire town is Newfane, and the largest municipality is the town of Brattleboro.