Saint Monica Preparatory is a parochial, co-educational Catholic school in Santa Monica, California, consisting of students in grades Transitional kindergarten to grade 12.

It is located in the Archdiocese of Los Angeles and serves the parish of St. Monica Catholic Church.

[4] Saint Monica was established in 1899 by the Sisters of the Holy Names of Jesus and Mary.

The elementary and high schools had long been affiliated with one another as parish schools serving the St. Monica Catholic Church but were administered separately.

In the spring of 2022, the school board announced that the two schools would merge into one legal entity under a single administration beginning in the 2022–23 academic year.