Connecticut River Greenway State Park is a Massachusetts state park consisting of separate state land holdings, including open spaces, parks, scenic vistas, archaeological sites, and historic sites, along the Connecticut River in the Pioneer Valley of western Massachusetts. The park includes critical wildlife and plant habitat as well as areas providing public access to the river in its run across the state and is intertwined with other protected land including farmland under state-held agricultural preservation restrictions (a type of conservation easement), municipal and conservation land trust holdings, and state and national wildlife refuges.