New Ipswich is a town in Hillsborough County, New Hampshire, United States. The population was 5,204 at the 2020 census. New Ipswich, situated on the Massachusetts border, includes the villages of Bank, Davis, Gibson Four Corners, Highbridge, New Ipswich Center, Smithville, and Wilder, though these village designations no longer hold the importance they did in the past. The Wapack Trail passes through the community.

Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2020 census, the population was 422,937, almost one-third the population of the entire state. Its county seats are Manchester and Nashua, the state's two biggest cities. Hillsborough is northern New England's most populous county as well as its most densely populated.