Saint Mary's High School is a private Catholic high school in Manhasset, New York. St. Mary's parish is part of the Roman Catholic Diocese of Rockville Centre yet the High School serves families of the Roman Catholic Archdiocese of New York, the Diocese of Brooklyn and the Diocese of Rockville Centre. It is located off Northern Boulevard at 51 Clapham Avenue, Manhasset, near the Miracle Mile. St. Mary's Men's Varsity Ice Hockey is the all-time leader in State Championships.