Trinity High School is a private coeducational Roman Catholic college preparatory High School, located in Garfield Heights, Ohio, United States. It is located in the Roman Catholic Diocese of Cleveland. It was started in 1926 by the Sisters of St. Joseph of the Third Order of St. Francis. Trinity has a 26-acre (110,000 m2) campus that includes the main school building and several athletic fields. The school is accredited by the North Central Association of Colleges and Schools, the Ohio Department of Education, and the Ohio Catholic School Accrediting Association.