Holy Trinity is a private Catholic school for students in preschool through the eighth grade.

The Our Lady of Lourdes facility in Mountainside provides Kindergarten and preschool classes, while classes for higher grades are at the campus in Westfield.

In the words of school officials, Holy Trinity "emphasizes the values of our faith and continually seeks to build a community where priests, parents, parishioners, students, faculty and staff share a common concern for the spiritual and educational growth of each individual."

The School is operated under the auspices of the Newark Archdiocesan School System.