Souhegan Cooperative High School is a Coalition of Essential Schools high school located in Amherst, New Hampshire, in the United States. Students from Amherst and Mont Vernon attend Souhegan for 9th through 12th grades. There are about 750 students. The school was founded based on the work of Theodore R. Sizer, a former dean of the Harvard Graduate School of Education, a notable American education reform leader and the father of the Essential Schools movement. Notably, Souhegan's progressive reputation has been chronicled in the book Standards of Mind and Heart: Creating the Good High School by Tony Wagner, Peggy Silvia and Dr. Robert A. Mackin. Based on this history, the school was founded with the mission "Souhegan High School aspires to be a community of learners born of respect, trust and courage." The school name is derived from its proximity to the Souhegan River, which adjoins the school property. The word Souhegan comes from the Algonquin language, meaning "waiting and watching place".

Amherst is a town in Hillsborough County in the state of New Hampshire, United States. The population was 11,753 at the 2020 census. Amherst is home to Ponemah Bog Wildlife Sanctuary, Hodgman State Forest, the Joe English Reservation and Baboosic Lake.