Announcing the Launch of LAMARswims.com, the comprehensive website for all Aquatic Activities at Lamar High School. Lamar High School is the largest High School in the Houston Independent School District, with an enrollment of 3,549 students. Located in the Upper Kirby district, at 3325 Westheimer Road in Houston, Texas, United States, with a zip code of 77098. Lamar primarily serves the Houston neighborhood of River Oaks and the incorporated city of West University Place There is a joke in the River Oaks community that states that River Oaks Boulevard is the only street with a country club at both ends. One is the River Oaks Country Club, and the "other" is Lamar High School.

Lamar has a business magnet program offering a wide array of business management courses, as well as cooperation with the Houston business community to provide internships and university scholarships.

Lamar has one of two high school-level IB Diploma programs in the Houston Independent School District, and therefore is one of HISD's six IB World Schools. Lamar High School consistently has the greatest number of students who graduate with the IB Diploma in Texas. Lamar offers many International Baccalaureate Diploma classes, including several foreign languages: Chinese, French, German, Hebrew, Italian, Japanese, Latin, Spanish, and Russian. In 2006, 86 students were awarded the IB Diploma, and one third of the school population consisted of candidates for the IB Diploma. Lamar has the largest IB Diploma program in North America.

The school handles grades nine through twelve. Lamar High School has neighborhood, Advanced Placement, and IB Diploma Programme (International Baccalaureate) programs. Lamar is annually one of the top schools in Texas and the United States, with some of the highest numbers of National Merit Scholars and Semifinalists. Lamar was ranked as 675th, 973rd, and 605th in Newsweek's 2005, 2006, and 2007 lists, respectively, of the top high schools in the United States.

The school is seen in the movie Rushmore. In Rushmore the campus is used as the setting for Grover Cleveland High School.The school was also featured in the Chuck Norris film: Sidekicks. Lamar High School's sports' mascot is the "Redskin" and our arch rivals are the Bellaire High Cardinals from Houston suburb Bellaire, Texas.

The “Roiling Waters” Natatorium was built in 1991 to replace the previous pool in the basement of the north building. Unlike the East and West buildings, which are connected to each other and the north building through a series of second-story crosswalks, the natatorium is completely separate from any other building.