Crystal Lake is a 401-acre (1.6 km²)^[1] water body located in Grafton County in western New Hampshire, United States, in the town of Enfield. Crystal Lake is part of the Mascoma River watershed.

Crystal Lake
Crystal Lake Location in New Hampshire Show map of New Hampshire Crystal Lake Location in the United States Show map of the United States
Location	Grafton County, New Hampshire
Coordinates	43°36′02″N 72°05′20″W / 43.60056°N 72.08889°W / 43.60056; -72.08889
Primary inflows	Bicknell Brook
Primary outflows	Crystal Lake Brook
Basin countries	United States
Max. length	1.6 mi (2.6 km)
Max. width	0.7 mi (1.1 km)
Surface area	401 acres (1.6 km2)
Surface elevation	890 ft (271 m)
Islands	1
Settlements	Enfield

The lake contains one small island: Oliver Island.

The lake is classified as a cold- and warmwater fishery, with observed species including rainbow trout, smallmouth bass, chain pickerel, horned pout, black crappie, and rock bass.^[1]

The lake is one of eight in New Hampshire which historically had a naturally occurring native lake trout population. These fish have since been extirpated from the lake.^[2]