Holderness is a town in Grafton County, New Hampshire, United States. The population was 2,004 at the 2020 census. An agricultural and resort area, Holderness is home to the Squam Lakes Natural Science Center and is located on Squam Lake. Holderness is also home to Holderness School, a co-educational college-preparatory boarding school.

Grafton County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 91,118. Its county seat is the town of Haverhill. In 1972, the county courthouse and other offices were moved from Woodsville, a larger village within the town of Haverhill, to North Haverhill.