Sag Harbor Union Free School District

Sag Harbor Union Free School District is a public school district located primarily in the Town of Southampton, with a small portion in the Town of East Hampton, on Long Island, in Suffolk County, New York, United States. It services the villages of Sag Harbor and North Haven, the majority of the hamlet of Noyack, as well as portions of the unincorporated communities of Sag Harbor and Sagaponack.

The total enrollment for the 2019–2020 school year was 919 students.

Sag Harbor is bordered by the Southampton and Bridgehampton school districts to the southwest, the Sagaponack and Wainscott districts to the south, and the East Hampton district to the southeast.