Admission Inquiry 
Contact us 
WELCOME TO
St. John XXIII Catholic 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 Catholic School 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!
This year, the SJ23 Student Council is committed to strengthening our connection with the community by actively seeking ways to serve and support those around us. Our mission is to make a difference through outreach, volunteer projects, and partnerships with local organizations and individuals who ...have had a positive impact on our school community, and with the people/causes that matter most to us. Through compassion, leadership, and teamwork, we hope to inspire our fellow students to join us in giving back and making our community stronger together.
Below are the first initiatives to kick off this mission:
🐾Wisconsin Humane Society Drive: Beginning November 1st through December 12th, we will be collecting items for the Wisconsin Humane Society (Ozaukee Campus), along with monetary donations to directly support their mission. Thanks to generous supporters, they are able to rescue, rehabilitate, and find loving homes for thousands of animals every year. *Items and money can be delivered to the School Office! (Wish List: https://www.wihumane.org/donate/wish-list) We will be personally delivering the collected donations to the Humane Society aboard our Kindness Bus. This will give students the opportunity to witness firsthand the difference our school community is making and reinforce the values of service and compassion.
🥤Root Beer Float Sale for Local Police Department: On November 14th, we will host a Root Beer Float Sale during both Elementary and Middle School lunch. If your student(s) is interested, they should bring in $2. The money raised will be used to provide donuts and coffee for our local Police Department as a gesture of appreciation. Following the Root Beer Float Sale, we will deliver the treats to the Police Department in person.
Together, we hope to lead by example. Thank you for your support!
We are so excited to partner with From Scratch Catering for the upcoming Key Event! Join us for an unforgettable evening of great food, fun, and community—all while supporting the mission of St. John XXIII Catholic School. Reserve your seat at the table or become a sponsor today at ...keyevent2026.cbo.io.
Last Game! What a weekend for SJ23! 🏐
Last game of the season for 5th/6th Grade Girls 🏐
Today, students explored the structure and function of the mammalian heart by dissecting a sheep heart. They identified major chambers, valves, and vessels, and related them to blood flow and human heart anatomy.