Natchaug Elementary School is a public elementary school in Willimantic, Connecticut, United States. The school opened in 1865 at the junction of Milk Street and Jackson Street, in downtown Willimantic. It is part of the Windham Public School system and one of four elementary schools and a K-8 STEM magnet school. Natchaug is accredited by the New England Association of Schools and Colleges. The name Natchaug comes from the Nipmuc word meaning "land between the rivers." The school colors are bright green and blue.