About Us

Born of a collaboration between the Dominican Sisters of San Rafael and the De La Salle Christian Brothers, Justin-Siena High School has served families in the Napa Valley and beyond since 1966. Although firmly rooted in Napa, we are a part of a Lasallian ministry that spans, continents, centuries, and generations. 

We celebrate our Lasallian Catholic heritage as a college preparatory school. We serve as sisters and brothers to our students, celebrate God’s holy presence, and commit ourselves to ensuring access to those who seek this experience.