Garrison Union Free School, also referred to as just Garrison School, educates students from kindergarten through eighth grade in the eponymous school district, which covers the hamlet of Garrison and nearby areas of the towns of Philipstown and Putnam Valley in Putnam County, New York, United States. It is located on NY 9D near the center of the hamlet, right across from St. Philip's Church in the Highlands, where it was originally located when established in 1793.