St. Augustine Catholic High School is a private, coeducational, Roman Catholic high school on the east side of Tucson, Arizona, United States, located in and administered by the Diocese of Tucson.

The school opened in August 2003.

[2] As of the 2022–23 school year it enrolled 260 students, and was accredited as a college-preparatory school by the Western Catholic Educational Association.

[1] The school draws from throughout the Tucson area; approximately 74 percent of the student body was Hispanic/Latino by ancestry.

About 95 percent of students received financial aid, and of those, 75 percent had their tuition fully covered by aid.