Admission Inquiry 
Contact us 
WELCOME TO
OUR SCHOOL
St. John XXIII Catholic School (SJ23) provides a foundation of Catholic values and academic excellence for its students in preschool through 8th grade. Our faculty and staff are dedicated to building a strong academic, social, emotional, and spiritual foundation for our students.
Learn More About Our Community
“I am beyond grateful for what St. John XXIII and the entire staff has done for my family. My kids would not be in the places they are if it weren’t for the dedication and love of the teachers and staff. THANK YOU ALL.”
– Current Parent
WE ARE EXCITED TO MEET YOUR FAMILY
Choosing the right educational option for your child is one of the most important decisions you will make. It’s important that your child’s school is an educational partner with like-minded values and goals, dedicated to helping your child reach his or her social, emotional, intellectual, physical, and spiritual potential. If you are interested in becoming part of our school community, we welcome you to contact us today!
Quick links to help you
STAY CONNECTED
EXTRACURRICULAR CLUBS
Clubs meet from 3:30-4:30 PM and are held in two sessions:
3D Printing & Coding
Amazing Aspiring Artists
Bucket Drumming
Chess
Flag Football
LEGO Club
Sign Language
Soccer
Strategic Games
Volleyball
Watercolor Painting
Why St. John XXIII Catholic School?
Check us out on Facebook!
We are thrilled (and grateful!) to share that The Key Event – Casino Royale is officially sold out. Thank you for the incredible support from our SJ23 community!
♠️ Still want to be part of the excitement? The Silent Auction is set to open on February 21st at 3:00 PM. Everyone is ...invited to bid—no event ticket required! Our silent auction is packed with fantastic items and experiences, and every bid directly supports St. John XXIII Catholic School.
Other Ways to Support:
♥️Make a donation
♣️Become a sponsor
♦️ Share the auction link with family and friends
Join the fun and support our mission here:
https://keyevent2026.cbo.io/
Thank you for helping make this event—and our school—so special!
Film Day with @catholicmilwaukee ♥️ Can't wait to share more...SOON!
Congratulations to our School Mission Award Recipients for January! We are so proud of you!
February is a great time to start thinking about next school year—and we’d LOVE to meet your family! We are now enrolling for the upcoming school year at St. John XXIII Catholic School. Come see what makes our community so special and why families call SJ23 home.📍Schedule a visit and learn ...more today: https://stjohn23rd.school/contact/
*Thank you to Georgia Didier, an alumni of SJ23, for helping capture these moments and tell our story.
We hope our students had as much fun this week as we did! Thank you to our incredible staff for the love, time, and creativity you pour into making meaningful memories every day. And to our students—thank you for the laughter, the joy, and the countless giggles that remind us why we are so ...blessed to do what we do. This week was a beautiful reminder that our school is more than a place of learning; it’s a place filled with care, faith, and lots of smiles.
We LOVE Catholic Schools Week!
Thanks to @impactperformingartscenter for the fun sunglasses! ♥️