| Official Name: | Knollcrest, Connecticut |
| Settlement Type: | Census-designated place |
| Mapsize: | 250px |
| Pushpin Map: | Connecticut#USA |
| Pushpin Label: | Knollcrest |
| Pushpin Label Position: | left |
| Coordinates: | 41.5011°N -73.4667°W |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Fairfield |
| Subdivision Type3: | Region |
| Subdivision Name3: | Western CT |
| Subdivision Type4: | Town |
| Subdivision Name4: | New Fairfield |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.44 |
| Area Land Km2: | 0.44 |
| Area Water Km2: | 0.0 |
| Population As Of: | 2020 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 500 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 06812 (New Fairfield) |
| Area Code: | 203/475 |
| Blank Name: | FIPS code |
| Blank Info: | 09-40920 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2805950 |
Knollcrest is a census-designated place (CDP) in the town of New Fairfield, Fairfield County, Connecticut, United States. It is in the northeast part of the town, on a peninsula on the western side of Candlewood Lake. It is bordered to the northeast, across Squantz Cove, by Bogus Hill.
Knollcrest was first listed as a CDP prior to the 2020 census.[1] The community was established in 1936.
Knollcrest is known for its Dutch-style windmill. It was constructed in 1936 as a functional water pump. The structure is 80 feet tall and houses a 3,000 gallon copper water tank. The windmill currently serves as the main office for the community.[2] It was commissioned by the Homelander Company and was designed by Charles A. Federer.[3]