Quasset Lake is a census-designated place (CDP) in the southeastern part of the town of Woodstock in Windham County, Connecticut, United States, surrounding a lake of the same name. (Federal topographic maps use the name "Wappaquasset Pond".) It is bordered to the east by South Woodstock. As of the 2020 census, Quasset Lake had a population of 187.
Quasset Lake was first listed as a CDP prior to the 2020 census.