| Official Name: | Quasset Lake, Connecticut |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Connecticut#USA |
| Pushpin Label: | Quasset Lake |
| Coordinates: | 41.9225°N -71.9839°W |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | Connecticut |
| Subdivision Type2: | County |
| Subdivision Name2: | Windham |
| Subdivision Type3: | Town |
| Subdivision Name3: | Woodstock |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.20 |
| Area Land Km2: | 0.84 |
| Area Water Km2: | 0.36 |
| Population As Of: | 2020 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 572 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 06281 (Woodstock) |
| Area Code: | 860/959 |
| Blank Name: | FIPS code |
| Blank Info: | 09-63165 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2805994 |
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.[2] (Federal topographic maps use the name "Wappaquasset Pond".) It is bordered to the east by South Woodstock.
Quasset Lake was first listed as a CDP prior to the 2020 census.