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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.
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“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!
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2026-2027 EXTRACURRICULAR CLUBS
Clubs meet from 3:30-4:30 PM and are held in two sessions:
Dance Club
Piano Club
Coloring & Paint-By-Number
Magic School (AI & Creativity) Club
Construction (LEGO) Club
Early Childhood Building Club
Introduction to 3D Printing
Wild Card Club
Board Games
Sign Language
Sole Mates | Walking Club
Why St. John XXIII Catholic School?
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Our halls are full again with happy faces, new friendships, familiar smiles, and so much excitement for the year ahead. Today was all about getting to know our classmates, making new friends, meeting our teachers, and settling into our classrooms. We were especially grateful to have Father Kirk Read morejoin us to bless each classroom as we begin a new school year together.
This year, our theme is simple but powerful: GO MAKE A DIFFERENCE. Big or small, every kind word, helping hand, brave choice, and thoughtful action can make a difference. We can’t wait to see the difference our students make in their classrooms, our school, and our community this year.
Welcome back, SJ23! We’ve missed you!
Today, we ask You to be with every student as they begin a new school year. Be especially close to those who may feel nervous, worried, or unsure. Help them feel welcomed, included, and reminded that they are never alone.
Give our new students courage to try new things, strength to make new Read morefriends, and confidence to know that they belong here. Bless our teachers and staff with patience, kindness, and joyful hearts as they welcome each child.
Help us all to look for someone who needs a friend, lend a helping hand, and make our school a place where everyone feels loved.
Guide us throughout this year as we Go Make a Difference in the lives of others.
Amen.
School’s back. Might as well make an entrance. 😎
SJ23 kicked off the new year with a little extra school spirit—and we were happy to bring the POP.
Custom balloon garland + glowing SJ23 LED letters turned their back-to-school event into a celebration and gave everyone a Read morepretty great reason to stop for a photo.
What an amazing group of educators!! Cheers to a new year.
#BackToSchool #SchoolSpirit #SchoolEvents #MilwaukeeEvents #BalloonDecor #EventDecor #WilhelminaBalloons #LEDMarquee #MilwaukeeSchools #WeMakeItPOP
Our 2027 Raffle Calendars are now for sale! For just $20, you could win cash throughout the first six months of 2027 — and winning tickets are re-entered after every drawing, so you can win more than once!
💰 $3,450 in total prizes!
📅 Drawings run January 1–June 30, 2027 ($25 everyRead more Monday, Wednesday & Friday, $50 every Sunday, $100 on New Year’s Day, Easter, Mother’s Day & Father’s Day)
How to Purchase: Find an SJ23 Student who would be happy to help OR bring cash or a check payable to St. John XXIII Catholic School (Attn: Raffle Calendar) to the Parish or School Office.
Calendars are available through December 18, 2026. Sales must be received by 3:30 PM on December 18. Grab yours and give yourself six months of chances to win! Good luck!
🎉 WELCOME BACK, SJ23! 🎉
The halls are ready. The classrooms are ready. Our teachers are READY… and now we’re just waiting for YOU!
After a summer full of adventures, sunshine, camps, vacations, late nights and maybe a little too much screen time, it’s finally time to Read moreget BACK TOGETHER!
We can’t wait to see our students walk through those doors, reconnect with friends, meet their teachers, make new memories and fill our school with the energy and joy that only our students can bring.
Here’s to a brand-new school year filled with learning, laughter, friendship, faith and plenty of reasons to celebrate!
Welcome back, students! We’ve missed you! Let’s make this our BEST YEAR YET!
Back to School Night is TODAY! We can’t wait to welcome our families! Come meet your teachers, see your classrooms, reconnect with friends, and get ready for an amazing school year.