Archbishop Mitty High School is a private Catholic high school located in San Jose, California, United States. The school is named for John Joseph Mitty, the fourth Archbishop of San Francisco. It is one of many Diocesan Catholic high school in the Santa Clara Valley alongside Bellarmine College Preparatory, Saint Francis High School, Presentation High School, and Notre Dame San Jose High School. Construction of the school began in 1963, and when completed, the campus occupied its present 24 acres (9.7 ha).

Initially, brothers and priests of the Society of Mary (Marianists) were given responsibility to conduct the school. The school opened in the fall of 1964 with 189 male students, and the first classes of Archbishop Mitty were held on the grounds of the adjacent Queen of Apostles Elementary School. The newly completed high school buildings were occupied in April 1965. Archbishop Mitty High School expanded its student body in 1969 and began sharing classes with Mother Butler Memorial High School (on the site of the current Harker School upper school campus) and St. Lawrence Girls High School. Consolidation of the three schools was completed by the fall of 1972. With the creation of the Diocese of San Jose in 1981, Archbishop Mitty became the only high school owned and administrated by the Diocese.

As a Catholic college preparatory school, Archbishop Mitty requires coursework in English, mathematics, social studies, science, one of four modern languages (Spanish, French, American Sign Language, and Mandarin Chinese), fine arts, physical education, and religious studies. Archbishop Mitty also provides an honors and Advanced Placement program, offering students over 34 AP courses and honors courses.

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The Archbishop Mitty Monarchs field 67 teams in 25 sports, most of them in the West Catholic Athletic League of the CIF Central Coast Section. Sports include football, badminton, basketball, baseball, cross country, field hockey, golf, soccer, softball, swimming, diving, tennis, track and field, volleyball, water polo, wrestling, and lacrosse. The Monarchs have a total of 10 national championships as of September 2024. In 2020, the school was named the Cal-Hi Sports School of the Century. In 2009, the school's girls athletic program was ranked first in the state and third in the nation by Sports Illustrated after Mitty won state championships in softball, women's volleyball, women's swimming, and women's tennis.

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• Archbishop Mitty High School website