The National Collegiate Athletic Association (NCAA, often pronounced "N-C-Double-A") is a voluntary association of about 1,200 institutions, conferences, organizations and individuals that organizes the athletic programs of many colleges and universities in the United States and potentially beginning in 2008, Canadian universities. Its headquarters are located in Indianapolis, Indiana, and it is currently under the leadership of president Myles Brand. The NCAA is the largest collegiate athletic organization in the world, and because of the great popularity of college sports among spectators in the United States, it is far more prominent than most national college sports bodies in other countries.

In August of 1973, the current three-division setup of Division I, Division II, and Division III was adopted by the NCAA membership in a special convention. Under NCAA rules, Division I and Division II schools can offer scholarships to athletes for playing a sport. Division III schools may not offer any athletic scholarships. Generally, larger schools compete in Division I and smaller schools in II and III. Division I football was further divided into I-A and I-AA in 1978. Subsequently the term "Division I-AAA" was added to delineate Division I schools which do not field a football program at all. In 2006, Divisions I-A and I-AA were respectively renamed the Football Bowl Subdivision (FBS) and Football Championship Subdivision (FCS).

The NCAA's legislative structure is broken down into cabinets and committees, consisting of various representatives of its member schools. These may be broken down further into sub-committees. Legislation is then passed on to the Management Council, which oversees all the cabinets and committees, and also includes representatives from the schools, such as athletic directors and faculty advisors. Management Council legislation goes on to the Board of Directors, which consists of school presidents, for final approval.

The NCAA staff itself provides support, acting as guides, liaison, research and public and media relations. The current NCAA president is Myles Brand, former president of Indiana University.

Sports sanctioned by the NCAA include basketball, baseball (men), softball (women), football (men), cross country, field hockey (women), bowling (women), golf, fencing (coeducational), lacrosse, soccer, gymnastics, rowing (women only), volleyball, ice hockey, water polo, rifle (coeducational), tennis, skiing (coeducational), track & field, swimming & diving, and wrestling (men's).

The NCAA is not the only collegiate athletic organization in the United States. The National Association of Intercollegiate Athletics (NAIA) is another collegiate athletic organization. The Canadian equivalent to NCAA is the Canadian Interuniversity Sport (CIS).

NCAA site for fans is now online at ncaafansite.com. This site www.ncaafansite.com has history, sports faq, photo gallery, video and forum.