St. Thomas the Apostle Catholic School

Educating and Forming Saints.





About Us

St. Thomas the Apostle Catholic School is a private, Roman Catholic PK-8th grade school in Crystal Lake, Illinois, United States. St. Thomas is located in the Roman Catholic Diocese of Rockford. 

Our amazing programs include Spanish, Technology, Athletics, and many more!

Get started by checking out our transfer grant program, preschoolkindergarten, or get to know our Faculty and Staff!

Our Mission and Vision

A commitment to a Quality Catholic Education,
By Living and Sharing the Gospel of Jesus Christ.
Students will grow in wisdom and knowledge with their faith inspiring them in all subjects.
Teachers will prepare their students for this world, always with a faithful eye on the next.
Parents will embrace the promises they made for their children at Baptism,
(to be the first and best teachers in the ways of the faith of Jesus Christ).


Upcoming Events

19 August

Teacher Institute

21 August

Begin 2024-2025 - T1
7:30 am – 7:45 am
Backpack Blessing
7:45 am – 8:30 am
Parent Welcome Breakfast (Lower Pierson)

31 August

10:00 am – 11:30 am
Athletics Kick Off

4 September

5:00 pm – 8:00 pm
Welcome Back Skate Night (Extreme Wheels)

15 November

End 2024-2025 - T1

18 November

Begin 2024-2025 - T2