Thornton Academy is a co-educational, independent boarding and day school serving grades 9–12 located in Saco, Maine. Thornton Academy also opened a full-time, private junior high school on its campus, named Thornton Academy Middle School, which serves grades 6-8 for Saco, Dayton and Arundel students.

Saco is a city in York County, Maine, United States. The population was 20,381 at the 2020 census. It is home to Ferry Beach State Park, Funtown Splashtown USA, Thornton Academy, as well as General Dynamics Armament Systems, a subsidiary of the defense contractor General Dynamics. Saco sees much tourism during summer months due to its amusement parks, Camp Ellis Beach and Pier, Ferry Beach State Park, and proximity to Old Orchard Beach.