Trinity Catholic High School is a coeducational college preparatory Diocesan high school located on 26 picturesque acres in northern Stamford, Connecticut. Serving the Fairfield County, Lower Westchester County communities. It was regionalized in 1991 from St. Mary's (Greenwich), Stamford Catholic (Stamford), and Norwalk Central Catholic (Norwalk). 98% of Trinity graduates continue their education, attending some of the nation's most prestigious colleges and universities.

Trinity Catholic is accredited by the New England Association of Schools and Colleges, Inc. and the Connecticut State Department of Education. The faculty number 38, 85% holding advanced degrees. Teacher-student ratio is 1:13 which allows individualized specialized personal attention to all students.