The Cedar Grove School is a historic one-room schoolhouse located at 4216 County Route 516 in Old Bridge Township of Middlesex County, New Jersey, United States. Built in 1885, it was added to the National Register of Historic Places on October 24, 1976 for its significance in education and community history. It was named after the nearby cedar trees and cedar swamp. With Since 1964, the building has been the Thomas Warne Museum, run by the Madison–Old Bridge Township Historical Society.

See also National Register of Historic Places listings in Middlesex County, New Jersey List of museums in New Jersey

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