Justin-Siena is a Catholic high school in the Lasallian tradition called to provide educational excellence in a loving, Christ-centered community that prepares students to serve and lead in an ever-changing world. 
At Justin-Siena, students are nurtured and challenged to become the best version of themselves and to truly realize their full potential.
Our students learn and grow in an inclusive community of faith, representing a 300-plus-year Lasallian tradition of respect, welcome, and hospitality.
Our students have different passions, gifts, personalities, and backgrounds. In their diversity, our students have this in common: they love each other, and they love their school. They are ALLHEART.

List of 8 items.

  • 85%

    Participate in a Club
  • $4.1 mil

    Tuition assistance given annually
  • 17

    Service Immersion and Retreat Trips
  • 99%+

    matriculate to college
  • 650+

  • 50%

    Students receiving tuition assistance
  • 33

    Athletic Teams
  • 23

    Average Class Size


Come Visit Us!

The best way to experience all Justin-Siena has to offer is to come visit. We look forward to welcoming you soon!

Justin-Siena High School

4026 Maher Street
Napa, CA, 94558
United States
T: 707.255.0950 
F: 707.255.0334

"Sempre Avanti"

Justin-Siena is a Lasallian Catholic college preparatory community that serves young people in grades 9–12.