Lyndon is a town in Caledonia County, Vermont, United States. The population was 5,981 at the 2010 census. Lyndon is the home of Lyndon State College. The town contains one incorporated village, Lyndonville, and three unincorporated villages: Lyndon, Lyndon Center, and East Lyndon.
Lyndon is the second-most populous town in the Northeast Kingdom; only neighboring St. Johnsbury is larger. It is also the fastest growing town in Vermont with a population over 5,000, growing 9.8% in the decade preceding the 2010 census.