New Hampshire Route 10 is a 122.25-mile-long (196.74 km) north–south state highway in western New Hampshire, United States. Its southern terminus is in Winchester at the Massachusetts state line, where it continues south as Massachusetts Route 10. Administratively, the northern terminus is at a junction with U.S. Route 302 in Haverhill.

Winchester is a town in Cheshire County, New Hampshire, United States. The population was 4,150 at the 2020 census. The primary community in the town, where 1,606 people resided at the 2020 census, is defined by the U.S. Census Bureau as the Winchester census-designated place (CDP). The town also includes the village of Ashuelot and part of Pisgah State Park.