Can't Find Something? Our website is undergoing some changes. If something is missing, please call 314-741-1333 for assistance.

Better Education. Brighter Future.


  • TRINITY CATHOLIC HIGH SCHOOL: Better Education. Brighter Future
  • Normal office hours are in effect. We are here to assist Monday through Friday 7:30 am to 3 pm.
  • Covid-19 Information

Welcome to Trinity Catholic High School

Trinity Catholic High School, founded on the proud traditions of Mercy, St. Thomas Aquinas, Rosary and St. Thomas Aquinas-Mercy High Schools, is a co-educational, college preparatory high school serving North Saint Louis County and the surrounding areas. Its quality academic program is unmatched in value and recognizes the uniqueness and diversity of each student's talent, intellect, style, and ability. Trinity Catholic students are taught to think critically, live virtuously and serve joyfully.

students in the hallway posing for a picture
students throwing their caps at graduation celebration
students lighting candles

Good News at Trinity

$4.6 Million

Class of 2020 College Scholarships


Graduation Rate

75 Graduates

Class of 2020


Graduates to Date (includes alumni from Mercy, Rosary, Aquinas, Aquinas-Mercy and Trinity Catholic)

Trinity Calendar

Kathy Torrington receives 2020 Emerson Excellence in Teaching Award
Returning Families: The Re-Enrollment Deadline for the 2021-2022 school year is February 26th. Parents go to your Parent Portal and complete the re-enrollment process.