Wilton is a town in Hillsborough County, New Hampshire, United States. The population was 3,896 at the 2020 census. Like many small New England towns, it grew up around water-powered textile mills, but is now a rural bedroom community with some manufacturing and service employment. Wilton is home to the High Mowing School, a private preparatory school.

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.