Lake Wentworth is located in Carroll County in eastern New Hampshire, United States, in the town of Wolfeboro. At 3,097 acres (12.53 km2), it is the seventh-largest lake located entirely in New Hampshire. Water from Lake Wentworth flows through the short Smith River into Crescent Lake and then over the dam into Lake Winnipesaukee in Wolfeboro. The 50-acre Wentworth State Park offers public access to the lake.
The lake is classified as a warmwater fishery, with observed species including rainbow trout, smallmouth and largemouth bass, chain pickerel, horned pout, and white perch.