The Green Mountains are a mountain range in the U.S. state of Vermont. The range runs primarily south to north and extends approximately 250 miles (400 km) from the border with Massachusetts to the border with Quebec, Canada. The part of the same range that is in Massachusetts and Connecticut is known as The Berkshires or the Berkshire Hills (with the Connecticut portion, mostly in Litchfield County, locally called the Northwest Hills or Litchfield Hills) and the Quebec portion is called the Sutton Mountains, or Monts Sutton in French.

All mountains in Vermont are often referred to as the "Green Mountains". However, other ranges within Vermont, including the Taconic Mountains in southwestern Vermont and the Northeastern Highlands, are not geologically part of the Green Mountains.