Las Lomas High School (LLHS) is a public high school in Walnut Creek, California, United States. It was founded in 1951 by the Acalanes Union High School District, and opened its doors in the fall of 1952 to its first graduating class. Las Lomas was the second of five schools built within the Acalanes Union High School District. It is a traditional high school serving grades 9-12, and has a history of both athletic and educational excellence. The school has a strong college preparatory program as well as many extracurricular programs. The colors of the school are maroon and gold and the school mascot is the Knight. Las Lomas had 1,482 students in 2011-12. The school has a 96.4% graduation rate, and about 97% of its graduates attend college. U.S. News & World Report ranked Las Lomas #372 in the nation in 2013. It was voted a National Blue Ribbon School in 2008.

Las Lomas High School was founded in 1951 as part of the Acalanes Union High School District (AUHSD). Situated in the suburban city of Walnut Creek, the high school has been closely integrated with the local community, with the majority of its students being residents of Walnut Creek.

The school provides arts courses including Advanced Art and Advanced Art Honors, as well as AP 2D Studio Art. They also have multiple Digital Design courses, using Adobe Suite, that provide dual enrollment with DVC. Math classes, from Algebra 1 to Advanced Calculus courses, including AP Calculus AB and BC. Sciences, including AP Biology, AP Chemistry, AP Physics, and AP Environmental Science. Language courses in French, Japanese, Mandarin, and Spanish, with some options for Advanced Placement (AP) courses. The school offers a range of social studies courses, including AP European History, AP Human Geography, AP US Government & Politics, and AP US History, among others. Las Lomas offers a variety of English courses, including Advanced Placement (AP) options such as AP English Language and Composition and AP English Literature and Composition. There are options for physical education courses, including Yoga, Team Sports, and Weight Training. The school offers computer science courses, including AP Computer Science A and AP Computer Science Principles. Las Lomas also provides courses in subjects like Drama, Music, Psychology, and Public Speaking, as well as specialized programs like the Biomedical Pathway, a PLTW program. The yearbook course is also an excellent opportunity for those who would like to preserve and capture the school's unique history and traditions.

New tennis courts were completed during the 2011-2012 school year. George DeKlotz Stadium, Las Lomas' new football stadium and track, was finished in 2005. At the same time, the baseball field reopened after a year of remodeling. A year prior, Las Lomas completed construction on a new softball field. Other facilities include a swimming pool, gym, small gym, five tennis courts, locker rooms, and a weight room.

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. (May 2024)

• Akhil Amar, constitutional scholar, Professor at Yale Law School.
• Brandon Harkins, professional golfer
• Kira Kazantsev, reporter
• Rich Nye, professional baseball player
• Markie Post, actress
• Katharine Ross, actress

• Las Lomas High School website
• Las Lomas High School parent reviews
• Acalanes Union High School District website