Wilmington is a town in Windham County, Vermont, United States. The population was 2,225 at the 2000 census.
The town was chartered in 1751 by Benning Wentworth, colonial governor of New Hampshire. It was named in honor of Spencer Compton, 1st Earl of Wilmington. Wilmington was once home to the Haystack Mountain Ski Area.
According to the United States Census Bureau, the town has a total area of 41.3 square miles (106.9 km2), of which, 39.4 square miles (102.1 km2) of it is land and 1.8 square miles (4.7 km2) of it (4.39%) is water. Wilmington is drained by the North Branch Deerfield River, as well as Meadow Brook, Rose Brook, Haystack Brook, Hall Brook, Ellis Brook, Beaver Brook, Negus Brook and Wilder Brook. It is located in the Deerfield Valley of the Green Mountains.