Knollcrest is a census-designated place (CDP) in the town of New Fairfield, Fairfield County, Connecticut, United States. It is in the northeastern 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. As of the 2020 census, Knollcrest had a population of 334.