Trinity Catholic High School was a regional, coeducational Catholic school for grades 9-12 located in Stamford, Connecticut.

The school was a member of the FCIAC athletic conference.

Trinity Catholic was accredited by the New England Association of Schools and Colleges, Inc. and the Connecticut Department of Education.

The school had an initial capacity of approximately 1,200 students, however, due to cost concerns and the demand for smaller student to faculty ratios, has since reduced its enrollment in order to set itself apart from other schools.

On February 27, 2020, the Most Reverend Frank J. Caggiano, Bishop of Bridgeport, announced[3] that Trinity Catholic High School would not reopen its doors for the 2020–21 academic year due to enrollment and budget issues.