Alta Loma High School is a public high school located in Rancho Cucamonga, California, United States, and is part of the Chaffey Joint Union High School District.

With funding received from state bonds, expansion work was done between 1998 and 2001, adding on a new Math and Science building, a new dance studio, weight rooms, and a new library, along with renovation work on sites around the campus.

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  Alta Loma High School gym

Alta Loma was a recipient of a Golden Ribbon Award from the California Department of Education in 2017 and a Silver Medalist for the U.S. News & World Report 2018 Best High Schools. Graduates from the Class of 2017 met the University of California A-G admission requirements at a rate of 66.2%.

Alta Loma is a member of the Palomares League of the CIF Southern Section. The school's football team plays its home games at Alta Loma's Uhalley Stadium.

This article's list of alumni may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are alumni, or by incorporating the relevant publications into the body of the article through appropriate citations. (January 2016)

• Carlos Bocanegra (graduated 1997), professional soccer player and former USMNT captain
• David Castain, American entrepreneur and philanthropist
• Charles Castronovo (graduated 1993), tenor and opera singer
• Kenyon Coleman (graduated 1997), NFL football player
• Travis Coons (graduated 2010), NFL football player
• Cameron Dunn (graduated 2001), professional soccer player who plays for Los Angeles Blues.
• Ejiro Evero, professional American football coach
• Rocky Long (graduated 1968), college football coach, head coach at San Diego State
• Sid Monge (graduated 1970), retired Major League Baseball relief pitcher
• Adam Parada (graduated 1999), professional basketball player
• Nancy Raabe (graduated 1972, nee Miller), author, composer, clergy
• Eric Weddle (graduated 2003), former National Football League free safety
• Larri Merritt (graduated 2016), YouTuber and social media influencer

• Alta Loma High School
• Chaffey Joint Union High School District