Better Education. Brighter Future.


Trinity Catholic High School celebrates the venerable traditions of Mercy High School (1948-1985), St. Thomas Aquinas High School (1954-1985), Rosary High School (1961-2003), St. Thomas Aquinas-Mercy High School (1985-2003), and Trinity Catholic High School (2003 – present). The legacies of each of these wonderful schools have merged to create our Trinity Catholic community.

We cherish those who have paved the way for Trinity Catholic, and we hope that the alumni of each of these schools keep in touch. All alumni have several options to get involved and reunite throughout the school year. Check the Trinity website for upcoming reunion events and other alumni events. See the Golf Tournament, Auction, and Booster Club sections for more information.


Thank You, Sister!


To watch our video honoring Sr. Karl Mary Winkelmann and her legendary career in Catholic education, please follow the link to our youtube page:


Help us keep you informed by calling the school to update your alumni profile. Keep an eye out for our alumni newsletters and special information.

For any questions about upcoming events, how to make a contribution to the school, or if you have information about upcoming reunion events or other important class information, contact the Advancement Office:

Kevin McKenna at or 314-741-1333 ext. 223.

or Connor Grumich at or 314-741-1333 ext. 230.



Transcript Requests:

Those who wish to receive a copy of their transcripts may fill out the form included below and return it to the Main Office. 

Transcript Request


Planned Giving

Planned giving, sometimes referred to as “legacy planning,” is a gift that enables donors to make larger gifts than they could make from their income. While some planned gifts provide a life-long income to the donor, others use estate and tax planning techniques in ways that maximize the gift and/or minimize its impact on the donor's estate.


We are pleased to have the Roman Catholic Foundation of Eastern Missouri as our Planned Giving partner.

The Foundation’s mission is to inspire giving and connect donors to Catholic ministries, sustaining the local church for future generations.  The Foundation assists donors with legacy gifts, from their will, trust, or retirement plan, to the Catholic parish, school or organization of their choice.

To learn more about ways to create your planned gift to provide lasting support for  <<the name of your organization>>, please visit the Foundation’s website