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Holy Trinity Diocesan High School is a private, Catholic, co-educational high school founded in 1966 by the Roman Catholic Diocese of Rockville Centre. Accredited by the New York State Board of Regents and by AdvancED, Holy Trinity has been  recognized by the U.S. Department of Education Exemplary Schools Program.

It is the mission of Holy Trinity High School to be a living witness to the Gospel of Jesus Christ as a community of faith, hope and love. We seek to educate the whole person: mind, heart, soul and body, and to motivate all students in the pursuit of truth and academic excellence, preparing them for future educational opportunities and service to the Church and to the world. 

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