Buckley Country Day School is an independent, coeducational day school providing elementary and middle education to 336 students in grades pre-nursery through eight in Roslyn, New York, United States. Buckley was founded in 1923 and opened the doors of its first building in Great Neck to a class of twenty-three children. It was begun as a day school but for a period accepted boarding students in the middle grades.

In 1955, as the school's enrollment continued to increase, Buckley moved to its current location in the Village of North Hills in Roslyn. It is operated on a not-for-profit basis by an appointed twenty-two-member Board of Trustees. It is chartered by the Board of Regents of the University of the State of New York. The school is accredited by the New York State Association of Independent Schools and is a member of the National Association of Independent Schools.