Monstra Matrem- "Show thyself a mother" describes the spirit of dedication to Our Lady, Mary, the mother of Jesus. She challenges the Amat students to live in the spirit of giving, caring and openness to the will of God which her life Exemplified.

School Colors and Ephitet

The student body and athelitc teams of Bishop Amat High School are known as the Lancers, a name selected by the first graduating class. the school colors are royal blue and gold.

School Seal

The Seal of Bishop Amat Memorial High School is taken from the Bishop's seal of Bishop Thaddeus Amat. The hat at the top belongs to the Bishop signifying the title archbishop with green cords draping from it. On the crest, the outstretched hands of Jesus are from the original seal of the diocese of Los Angeles-Monterey. The sword, appropriate for the Lancers, is from the family crest of Bishop Thaddeus Amat. The school’s motto, Monstra Matrem, is incorporated into the seal.