|Location||Merrimack County, New Hampshire|
|Primary inflows||Great Brook|
|Primary outflows||Blackwater River|
|Basin countries||United States|
|Max. length||1.8 miles (2.9 km)|
|Max. width||0.7 miles (1.1 km)|
|Surface area||602 acres (2.4 km2)|
|Surface elevation||805 feet (245 m)|
|Settlements||Elkins (town of New London)|
Pleasant Lake is a 602-acre (2.4 km2) lake located in Merrimack County in central New Hampshire, United States, in the town of New London. The village of Elkins is located at the east end of the lake, next to its outlet. Water from Pleasant Lake flows east to the Blackwater River, a tributary of the Contoocook River, and ultimately the Merrimack River.
The lake is classified as a cold- and warmwater fishery, with observed species including brook trout, landlocked salmon, smallmouth bass, chain pickerel, and horned pout. The state record landlocked salmon was caught in Pleasant Lake in 1914 (36", 18 lb, 8 oz).
There is an island on the lake (visible in the photo) which on old maps has the name "Granite Friends Island" but is better known today as "Blueberry Island." It is a destination for boaters and a favorite picnic spot.
Elkins Beach is a New London town beach, which, like the village of Elkins, is located near the outlet of Pleasant Lake. This beach is the primary swimming location on the lake for town residents and their families.