Liberty High School is located in Brentwood, California, United States. It is a comprehensive 9–12 grade high school serving approximately 2800 students. It was founded in 1902 as Liberty Union High School.

Liberty is organized into four Small Learning Communities (SLC). SLC leadership teams include an assistant principal, counselor, SLC coordinator and academy director. Career specific academy programs are available to students in grades 10 through 12. These programs highlight business & technology, health careers, teaching & learning careers, arts, and humanities.

Liberty is known for their Student Learning Careers, such as the TLC academy for students who plan on childcare or teaching careers, as well as their PADA academy for art-oriented students. In 2017, Liberty High PADA students completed a public beautification project in Oak Meadow Park by crafting a mural.

Liberty High School's official newspaper is The Lion's Roar. This quarterly publication is typically eight pages in length and is produced by approximately twenty students enrolled in Journalism. It was the second place bracket winner of the American Scholastic Press Association's newspaper competition in 2014 and 2015.

Liberty High School's teams are known as the Lions. Liberty competes in the Bay Valley Athletic League, and North Coast Section of the California Interscholastic Federation.

Sports teams offered include:

• Baseball
• Basketball (boys' freshman, junior varsity and varsity; girls' freshman, junior varsity and varsity)
• Cross country
• Football (freshman, junior varsity and varsity)
• Golf (boys' varsity and girls' varsity)
• Soccer (boys' junior varsity and varsity; girls' junior varsity and varsity)
• Softball (freshman, junior varsity and varsity)
• Stunt
• Swimming
• Tennis (boys' varsity and girls' varsity)
• Track and field
• Unified sports (soccer and bowling)
• Volleyball (boys' and girls')
• Water polo (boys' and girls')
• Wrestling (freshman, junior varsity and varsity)

Liberty won their first CIF state football championship in 2018.

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. (October 2021)

• Chris Gruler, drafted #1 by the Cincinnati Reds, 3rd overall in the 2002 Major League Baseball Draft, minor league baseball pitcher
• Brent Mydland, keyboardist and vocalist for the Grateful Dead from 1979 to 1990
• Jaden Rashada, college football quarterback
• Matt Riley, drafted in the 3rd round by the Baltimore Orioles in the 1997 Major League Baseball Draft
• Delanie Sheehan, soccer player for Gotham FC of the National Women's Soccer League
• Lisa Joann Thompson, dancer, actress, and choreographer, starred in In Living Color, Fame L.A., and Motown Live
• Sione Vaki, NFL safety for the Detroit Lions

• Official Liberty High School website
• California Public Schools Report
• Liberty Lions Roar website