Unity is a town in Sullivan County, New Hampshire, United States. The population was 1,518 at the 2020 census, down from 1,671 at the 2010 census. The town includes the villages of Unity, East Unity, Quaker City, and West Unity.

Sullivan County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 43,063, making it the second-least populous county in New Hampshire. Its county seat is Newport.