Catholic Memorial (CM) is an all-boys college preparatory school (grades 7–12) located in West Roxbury, Massachusetts, United States. It is part of the Roman Catholic Archdiocese of Boston and is administered by the Congregation of Christian Brothers.

Catholic Memorial High School, as it was called at the time, opened its doors on September 9, 1957, with 225 students and five Christian Brothers of Ireland in the former St. Theresa of Avila Parish School building. The building, now known as Donahue Hall, was donated to the Christian Brothers by Monsignor Charles A. Donahue, V.F., LL.D. who was the pastor of St. Theresa's.

The school was named "Catholic Memorial" at the suggestion of Richard Cardinal Cushing, to commemorate the sesquicentennial of the Archdiocese of Boston and as a memorial to Catholic donors.

Brother Joseph G. McKenna, C.F.C., was the first headmaster of Catholic Memorial; he opened a new school building which was dedicated by Cardinal Cushing on November 10, 1959. Three years later the classroom wing was opened and the enrollment increased to 1110 students.

In 1971 there were 22 Christian Brothers, but in 2016, only three.

The middle school opened in September 1993 with 185 students in grades 7 and 8.

The tuition charge for the 2023-24 school year was US$26,725. Scholarships are awarded upon admission to students in Catholic Memorial's middle school and high school programs. The admissions committee selects students for scholarship eligibility based upon their past academic performance and the results of the entrance exams. No applications are available for scholarships; instead, every application for admission is reviewed for scholarship potential. Financial aid is available for qualifying families. Over $1 million is given annually in financial aid.

Catholic Memorial offers 18 Advanced Placement courses in 2023.