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Always a Crusader

Always a Crusader

WELCOME HOME!

YOU will always be a Crusader!  You are our legacy.  You make a difference.  You inspire us by who you are, what you do and what you care about. You are changing lives and changing the world.  You make us proud.  We are stronger because of YOU!

Althoff Catholic strives to serve you no matter what your stage of life.  We hope to continue our relationship with you for many years to come.  Our goal is to help you reconnect with classmates and network with other alums and families and engage our current students. So please keep us updated about where you are and all the new things in your life so we can stay connected.

WAYS TO STAY CONNECTED

  • Attend an Alumni Event
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  • Become a Volunteer
  • Serve on the Young Alumni Committee

We would love to hear from you, so please contact us at advancement@althoffcatholic.org!

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Althoff Catholic High School
today
For this year’s Gala, our friends at Archford have issued a challenge to support technology at Althoff Catholic! In today’s ever-changing world, our students need the latest technology to thrive. In celebration of Althoff Catholic’s legacy, leadership, and lasting impact, Archford will match all gifts to our Technology Fund—dollar for dollar—up to $5,000. Make a gift today and double your impact on their future! https://althoffcatholic.ejoinme.org/technologymatch
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Althoff Catholic High School
2 days ago
Congratulations Mathletes! Results of the Regional Math Competition: On the Individual test: Junior Jacob Hug tied for 7th place (ribbon) and Junior Benjamin Tyler tied for 3rd place (MEDAL) The Algebra II team placed 2nd (PLAQUE) The Calculator team placed 3RD (PLAQUE & RIBBONS) The calculator team consisted of: Seniors Christian Youngmeyer, Joseph Gedman Juniors Jacob Hug and Callum McCoy Sophomore Grace Jansen Freshman Marshall Hagene, Marlena Youngmeyer, and Jillian Kimball Great job all around for the whole team! Way to go Althoff!
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  • Crusader Summer Camps

    Check out the Crusader Summer Camps available this summer! New camps added weekly. We hope you can join us!!!

  • Apply Today
    Both 2025-26 and 2026-27 applications are open! We accept transfer students throughout the school year. Apply Today!
  • Gala
    Please Join Us!The Althoff Catholic High School 2026"Denim and Diamonds"Gala and Dinner AuctionThe Regency O'Fallon400 R [ ... ]

    Please Join Us!

    The Althoff Catholic High School 2026

    "Denim and Diamonds"

    Gala and Dinner Auction

    The Regency O'Fallon

    400 Regency Park, O'Fallon, Illinois

    Saturday, March 7, 2026

    6:00 PM 
    Hosted Cocktails
    Silent and Super Silent Auctions  

    7:00 PM
    Multi-Course Themed Dinner
    State of the School Presentation
    Live Auction
    Fund a Need Presentation
    Post Gala "Dueling Pianos" Entertainment by Felix and Fingers  

    Denim and Diamonds Attire

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  • Financial Aid

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    See how you can become part of our volunteer community and get involved with different groups and projects!
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5401 W Main St.
Belleville, IL 62226
Main Office: 618.235.1100
Fax: 618.235.9535
info@althoffcatholic.org

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FACTS Website Services

Althoff Catholic High School admits students of any race, color, national, or ethnic origin to all the rights, privileges, programs, and activities generally accorded or made available to students at the school. It does not discriminate on the basis of race, color, national, or ethnic origin in administration of its educational policies, admissions policies, scholarship and loan programs, and athletic and other school-administered programs.

Gala 2026