What is St. John XXIII College Preparatory?

Updated

St. John XXIII College Preparatory (often abbreviated SJ23) is a private, coed Catholic high school in Katy, Texas, serving grades 9–12. Its website, sj23lions.org, is the school's official hub for admissions, academics, student life, athletics, giving, news, and calendars. If you are a prospective family researching the school, a current parent looking for schedules and tickets, or an alum checking news, this site is the primary source.

School at a glance

Item Detail
Location Katy, Texas
Type Private, coed Catholic high school
Grades 9–12
Opening year 2004
Student-to-faculty ratio 13:1
Course offerings 144 different courses
College acceptance (Class of '24) 100%
Scholarships awarded (Class of '24) $11M+
Alumni 1,200+

Mission and identity

The school describes its mission as forming "the hearts and minds of young men and women in a Christ-centered community dedicated to academic excellence, the pursuit of virtue, and service to others in the Tradition of the Catholic Church." The tagline "To Prepare in Mind and Heart" appears throughout the site, and the mission is framed around three emphases: faith, academics, and service.

What the website covers

The site is organized into main sections that map to how families and students actually use it:

  • About — welcome, board of directors, faculty and staff, employment
  • Admissions — how to apply, important dates, visit SJ23, tuition and financial aid, international student program
  • Academics — excellence in academics, college readiness, academic support services, library
  • Student Life — student leadership and houses, liturgy and campus ministry, fine arts, student organizations, event tickets
  • Athletics — varsity sports, athletic calendar, game tickets, SJ23 Sideline Store, summer at SJ23, support athletics
  • Support — give today, gala and auction, planned giving and endowments, SJ23 campaign
  • News — parent news, sports news, alumni news
  • Calendar — school calendar, athletics calendar
  • Store — school store, SJ23 Sideline Store
  • Tickets — game tickets, event tickets

A login option and a search function are also available in the site navigation.

Recent news and events

The site lists current items such as:

  • SJ23 Announces College Board AP Success (posted 8/24/2026)
  • SJ23 Feast Day Celebration — Oct 9, 2026
  • Parent Teacher Conferences — Oct 16, 2026 (schedule TBA)
  • Lisieux House Mass & Reception — Oct 21, 2026, 9:20 AM

These entries show the site functions as a live calendar and news source, not just a static brochure.

Who this page is for

  • Prospective families — start with Admissions (how to apply, important dates, visit, tuition and financial aid).
  • Current parents and students — use the calendars, news sections, stores, and ticket pages.
  • Alumni — check alumni news and the calendar for events like house masses and feast day celebrations.
  • International applicants — the International Student Program page under Admissions is the relevant entry point.

If you need specific figures such as current tuition, application deadlines, or ticket prices, those details are not included in the site excerpt above — check the Tuition & Financial Aid, Important Dates, and Tickets pages directly for the latest information.