Basketball Leagues and Associations: From FIBA to AAU

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A July weekend in a convention center with twelve courts going at once, college coaches in polo shirts lining the baselines. A bracket taped to the office fridge in March. A 3×3 game on a plaza court with music playing between possessions. Basketball has more organizations than almost any sport, and knowing who runs what helps players and parents make better choices. This guide covers the basketball leagues and associations that matter, from FIBA and USA Basketball to the NBA, WNBA, the newest pro leagues, college, high school, AAU and the Olympics, with facts as of the 2026 season.

Back to our basketball hub for the overview, or see the rules each level plays by.

The governing bodies: FIBA and USA Basketball

FIBA (the International Basketball Federation) is the world governing body, founded on June 18, 1932, by eight national federations and today made up of 213. Based in Mies, Switzerland, it writes the Official Basketball Rules and the 3×3 rules, runs the World Cups and is recognized by the International Olympic Committee as the sole authority for basketball.

USA Basketball is the national governing body for men’s and women’s basketball in the United States, recognized by FIBA and the US Olympic committee. It picks and trains the national teams (5×5 and 3×3) and, through a Youth Development Division set up in 2013, works on player development, coach education and licensing, and safety. With the NBA it published the youth guidelines we cover on our youth basketball page.

Pro basketball in North America

NBA

The National Basketball Association has 30 teams, each playing 82 regular-season games. The 2026-27 season tips off on October 20, 2026, and the in-season NBA Cup runs from late October to its final on December 11. The playoffs end with the NBA Finals in June.

NBA G League

The G League is the NBA’s official minor league and its research and development lab for rules. It has 31 teams in 2026-27, and since 2024-25 every NBA team has its own affiliate. Players must be at least 18 for the G League draft, younger than the NBA’s minimum. The league says 51 percent of players on opening-night NBA rosters in 2025-26 had G League experience.

WNBA

The Women’s National Basketball Association played its 30th season in 2026, starting May 8, with 15 teams, its biggest field yet, after adding the Toronto Tempo (its first Canadian team) and the Portland Fire. Each team played 44 regular-season games.

The new leagues

• Unrivaled: a women’s 3-on-3 league founded by WNBA stars Napheesa Collier and Breanna Stewart, played in Miami in the winter. It added two teams for 2026, for eight in all.
• Athletes Unlimited Pro Basketball: a short women’s 5-on-5 league; its fifth season ran in Nashville in February and March 2026.
• BIG3: a men’s 3-on-3 summer league. Its ninth season, in 2026, had eight teams playing from June 20 to the championship on August 22.
• Project B: a planned global women’s 5-on-5 tour that has signed WNBA players; its first event is scheduled for Hangzhou, China, in January 2027.

Europe and beyond

The EuroLeague is Europe’s top men’s club competition. It grew from 18 to 20 clubs in 2025-26, adding Dubai Basketball, Hapoel Tel Aviv and Valencia, with a 38-game regular season. The NBA and FIBA plan a new NBA Europe league to start in October 2027, with permanent teams in big European cities plus spots that clubs earn each year. Most countries also run their own national leagues under FIBA.

College basketball

• NCAA Division I: the biggest stage, ending with March Madness. Both the men’s and women’s tournaments expand from 68 to 76 teams starting with the 2026-27 season; the old First Four becomes a 12-game opening round. Athletic scholarships are allowed.
• NCAA Division II: athletic scholarships are allowed too.
• NCAA Division III: no athletic scholarships, though many players get academic or need-based aid.
• NAIA: a separate college association; its men’s championship has been played in Kansas City almost every year since it began.
• NJCAA: two-year junior colleges in three divisions, each with its own national tournament in March; the Division I men’s tournament is held in Hutchinson, Kansas. Junior college is a common bridge to four-year programs.

High school: the NFHS and state associations

The National Federation of State High School Associations writes the rules used by most US high schools, and its 51 member associations (every state plus the District of Columbia) run seasons and state tournaments. In 2024-25, 540,704 boys and 356,240 girls played high school basketball, according to the NFHS participation survey. Each state decides some rules for itself, such as whether to use a shot clock (32 states did in some form in 2025-26).

AAU, grassroots circuits and the Jr. NBA

Outside school, most competitive youth basketball is “club” or “travel” basketball, often just called AAU. The Amateur Athletic Union is a nonprofit multi-sport organization that sanctions teams and runs tournaments by age, from early grade-school divisions through high school, with national championships each summer. Not every club team plays AAU events; some play USA Basketball or independent tournaments.

At the top end, shoe companies run their own grassroots circuits with invited club teams: Nike’s EYBL (ending with the Peach Jam in July), adidas 3SSB and the Under Armour Association are the best known. College coaches can only watch in person during set evaluation periods; for Division I men, the May evaluation weekends are limited to NCAA-certified events. The Jr. NBA is the NBA’s own youth program for boys and girls 6–14, run with local partners like YMCAs and Boys & Girls Clubs.

Busy summer circuits are where load piles up: several games a day, several weekends in a row. The NBA and USA Basketball recommend no more than two games a day for players 9 and up, at least one rest day a week and caution with packed tournament schedules. Our basketball recovery page has tips for tournament weekends, and many families pack an electrolyte mix and a massage gun for the hotel.

The Olympics and 3×3

Basketball has been an Olympic sport since Berlin 1936, and NBA players have taken part since Barcelona 1992. FIBA’s 3×3 joined the program at Tokyo 2020 with eight men’s and eight women’s teams, and at Los Angeles 2028 it will be played at an outdoor venue in the Sepulveda Basin. USA Basketball runs 3×3 national teams and tournaments, and 3×3 is easy to start: one basket, three friends and one sub.

Health care changes with the level

Pro and college teams usually have their own medical staff. Many high schools have an athletic trainer, licensed or regulated health care professionals in all 50 states. A Saturday rec game or a club tournament may have no one. So at every level, coaches and parents should know the CDC’s HEADS UP rule: a player with possible concussion signs sits out the rest of the day and returns only after a healthcare provider clears them. Pack ankle support for players who need it (see our ankle brace guide), and read our basketball injuries page.

Whatever level you play, the ball matters. Two picks: the Wilson Evolution, the indoor game ball the maker says is NFHS and NCAA approved (about $100 on Amazon in October 2026), and the Wilson NBA DRV, an outdoor ball for driveways and park courts (about $17).

Basketball leagues FAQs

How many teams are in the NBA and WNBA?

The NBA has 30 teams. The WNBA had 15 in 2026 after adding the Toronto Tempo and Portland Fire.

What is the difference between FIBA and USA Basketball?

FIBA is the world governing body for basketball, with 213 national federations. USA Basketball is the US member: it runs the national teams and youth development programs in the United States.

Is AAU the same as club basketball?

Mostly. People say “AAU” for any travel or club team, but the AAU is one organization that sanctions teams and events. Clubs may also play in shoe-company circuits, USA Basketball events or independent tournaments.

How many teams make March Madness?

Sixty-eight through the 2026 tournaments. Starting with the 2026-27 season, the NCAA men’s and women’s tournaments each have 76 teams.

Is 3×3 basketball in the Olympics?

Yes. It debuted at Tokyo 2020 with men’s and women’s events and is on the program again for Los Angeles 2028.