Lancaster is a town in Coos County, New Hampshire, United States, on the Connecticut River named after Lancaster, England. As of the 2010 census, the town population was 3,507, the second largest in the county after Berlin. It is the county seat of Coos County and gateway to the Great North Woods Region. Lancaster, which includes the villages of Grange and South Lancaster, is home to Weeks State Park and the Lancaster Fair. Part of the White Mountain National Forest is in the eastern portion. The town is part of the Berlin, NH−VT Micropolitan Statistical Area.

The primary settlement in town, where 1,725 people resided at the 2010 census, is defined as the Lancaster census-designated place (CDP) and is located at the junctions of U.S. Route 3 and U.S. Route 2, along the Israel River.

Lancaster is the site of the "PorcFest" summer camp gathering of the Free State Project.

Granted as Upper Coos in 1763 by Colonial Governor Benning Wentworth to Captain David Page of Petersham, Massachusetts, the town was settled in 1764 by his son, David Page, Jr. and Emmons Stockwell. It was the first settlement north of Haverhill, 50 miles (80 km) to the south, and originally included land in what is now Vermont. Situated on the northern Connecticut River, the community endured many Indian hostilities. It would be named for Lancaster, Massachusetts, hometown of an early inhabitant. Reverend Joshua Weeks, a grantee of the town, was among the group of explorers who named the mountains of the Presidential Range. Other grantees were Timothy Nash and Benjamin Sawyer, who discovered Crawford Notch in 1771, making a shorter route to Portland, Maine possible.

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