|Location||Merrimack County, New Hampshire|
|Primary inflows||Sucker Brook|
|Primary outflows||Chance Pond Brook|
|Basin countries||United States|
|Max. length||1.7 mi (2.7 km)|
|Max. width||1.0 mi (1.6 km)|
|Surface area||606 acres (2.45 km2)|
|Average depth||18 ft (5.5 m)|
|Max. depth||39 ft (12 m)|
|Surface elevation||400 ft (120 m)|
Webster Lake is a 606-acre (2.45 km2) water body in Merrimack County in the central portion of the U.S. state of New Hampshire, in the city of Franklin. Water from Webster Lake flows to the Pemigewasset River shortly above its confluence with the Winnipesaukee River to form the Merrimack.
Webster Lake has two public beaches operated by the city of Franklin, one on either side of the lake. Webster Lake is surrounded by forests, and roads follow most of the lakeshore, allowing frequent views. There is boating access adjacent to Lagace Beach on New Hampshire Route 11.