The University of California, Los Angeles (generally known as UCLA) is a public research university located in Los Angeles, California, United States. Established as a branch of the state university in 1919, it is the second-oldest general-purpose campus in the University of California system and has the largest enrollment of any university in the state.

UCLA comprises the College of Letters and Science (the primary undergraduate college), as well as four other undergraduate colleges (Arts and Architecture, Herb Alpert School of Music, Henry Samueli School of Engineering and Applied Sciences, Nursing, and Theater, Film, and Television), seven professional schools, and five professional Health Science schools. Since 2001, UCLA has enrolled over 33,000 total students annually, and that number is steadily rising. Enrollment data: blank">Fall 2001–03 Fall 2002–04 Fall 2003–05. University of California System CSS Third Week Enrollment File (current). Retrieved May 30, 2007

UCLA is ranked 25th among "America's Best Colleges 2008: National Universities" by U.S. News & World Report, tied for third (with _University of Michigan) for best public universities in the United States, and placed 13th in the world in 2007 in ranking done by the Shanghai Jiao Tong University. UCLA also ranked 11th in the nation in terms of quality of scientific research leading towards a Nobel Prize. UCLA is a Public Ivy, and one of the 25 New Ivies, a list of universities ranked by Kaplan. UCLA also ranks among the top 10 schools in the country with the most faculty awards.

UCLA has more applicants than any other university in the United States. Out of 50,732 applicants for Fall 2007, 11,860 (23.38%) were admitted. Students come to UCLA from all 50 states and more than 100 countries, though according to statistics from 2001-05, an average 92.6% of the entire student body originated from California.

UCLA's athletic teams, the Bruins, have won 121 national championships, including 100 NCAA team championships as of 2007—first to have won 100 and still more than any other university.

In 2006, the university completed Campaign UCLA, which collected over $3.05 billion and is currently the most successful fundraising campaign in the history of higher education.