Heritage High School is a high school in Brentwood, California, United States. It opened on August 1, 2005, with a freshman and sophomore class.

In 2003 bids were taken for the construction of the school.

The school grew every year until it reached the capacity of all four classes (freshman, sophomore, junior, and senior) in 2008. The Heritage High School class of 2008 was the highest grade each year it was at Heritage, and was its first graduating class.

In 2012, the school became the first school in the district to ban the use of social media in school campaigns due to adverse social effects. In 2012, more than 50 students were suspended for a prank involving a lamb and washable paint.

In 2013, a large number of students and spectators required medical treatment due to extreme heat at the graduation ceremony.

In 2014, the school created an innovative program combining art and technology.

The school features include a state-of-the-art theatre, recording studio, broadcast studio (with green screen), and large rear projection screen TVs in every classroom. Its colors are gold, Columbia blue, and white, and its mascot is the Patriot. It was recently credited with the six-year status highest API score in the district.

The school is separated into four Small Learning Communities (SLCs), SLC-A1, SLC-A2, SLC-B, SLC-C, and SLC-D. SLC-A and SLC-D were the only SLCs open the first year of school, but the second school year saw the beginning of SLC-B, with SLC-C being partially used for PE teachers, and by 2007 it was being used completely. The Class of 2008 was the first class to graduate from Heritage High School, and the Class of 2009 was the first to have attended Heritage for all four years.

As of 2019, all four SLCs are being used and have been staffed with assistant principals.

In addition to Heritage's Small Learning Communities, the school also features four academies, which students can join to pursue an interest in a particular field of study. The four academies are:

• Law, Government, and Public Service
• Engineering Technologies
• Health and Recreation
• Environmental Science

The school is home to sports teams called the Patriots. Numerous sports compete in the North Coast Section Championships. Players and students come together and watch the teams compete. The Heritage 6th man also was nominated and won the title as the Best Sixth Man of the Year in the Bay Area.

In 2023 the school inaugurated girls flag football.

Extra-curricular activities, known as clubs, at Heritage include one of the best known drama/theater programs in the state after its production of Oliver in 2009 and Hairspray in 2012, band, Mock Trials, The Law Government and public Service Club, Model UN, Interact, Science Olympiad, Martial Arts Club, Math Club, Robotics Club, Asian Art Club, Harry Potter Club, Music Club, Filipino Club, Latinos Unitos Club, and a Leadership/Student Council.

• Paul Blackburn, professional baseball player with the Oakland Athletics

• Heritage High School webpage