By 1900, the game of basketball had spread to colleges across the country, marking its increasing popularity and adoption in higher education institutions.
In 1904, during the Summer Olympics, which featured basketball as a demonstration sport, Hiram College won the collegiate championship tournament held as part of the event.
In March 1908, the University of Chicago swept a two-game "championship series" against Penn, played in Philadelphia and Bartlett, Illinois, to win the series.
In 1915, a college team was a runner-up in the Amateur Athletic Union (AAU) U.S. national championship tournament, where college teams competed against non-college teams.
In 1916, Utah won the Amateur Athletic Union (AAU) U.S. national championship tournament. The AAU tournament often featured college teams playing against non-college teams.
In 1917, a college team was a runner-up in the Amateur Athletic Union (AAU) U.S. national championship tournament, where college teams competed against non-college teams.
In 1920, NYU won the Amateur Athletic Union (AAU) U.S. national championship tournament. The AAU tournament often featured college teams playing against non-college teams.
In 1921, a college team was a runner-up in the Amateur Athletic Union (AAU) U.S. national championship tournament, where college teams competed against non-college teams.
In March 1922, Wabash College won the National Intercollegiate Basketball Tournament held in Indianapolis. It was the first stand-alone post-season tournament exclusively for college teams.
In 1924, Butler won the Amateur Athletic Union (AAU) U.S. national championship tournament. The AAU tournament often featured college teams playing against non-college teams.
In 1925, Washburn won the Amateur Athletic Union (AAU) U.S. national championship tournament. The AAU tournament often featured college teams playing against non-college teams.
In 1932, a college team was a runner-up in the Amateur Athletic Union (AAU) U.S. national championship tournament, where college teams competed against non-college teams.
In 1934, a college team was a runner-up in the Amateur Athletic Union (AAU) U.S. national championship tournament, where college teams competed against non-college teams.
In 1937, the NAIA (National Association of Intercollegiate Athletics) established a regularly occurring national collegiate championship, marking an early effort to organize college basketball at a national level.
In 1937, the NAIB (National Association of Intercollegiate Basketball) was created for smaller colleges, to address the inequality in competition where all colleges were initially considered equal competitors.
In 1937, the first NAIA Men's Basketball National Championship was held, established by James Naismith to crown a national champion for smaller colleges and universities.
In 1938, the National Invitation Tournament (NIT) was founded and was considered the most prestigious post-season showcase for college basketball.
In 1939, the National Collegiate Athletic Association (NCAA) implemented its own national tournament. The NCAA tournament's location varied and used multiple locations each year.
In 1944, the NAIA Men's Basketball National Championship was not held.
In 1949, the CCNY Beavers men's basketball team achieved a double win, succeeding in both the NIT and NCAA Tournaments. The NIT comprised 12 and the NCAA 8 teams.
In 1950, the NCAA ruled that teams eligible for the NCAA tournament should participate in it and not in both the NIT and NCAA tournaments, following a double win by CCNY, marking a shift in power towards the NCAA.
In 1951, scandals based in New York City further bolstered the prestige of the NCAA tournament, making it more attractive to top teams and conference champions.
By 1960, the NCAA tournament had surpassed the NIT in prestige and popularity, fueled by success of teams from the west, such as UCLA.
In 1961 the Maccabiah Games were declared a "Regional Sports Event" by the International Olympic Committee.
In 1969, Spencer Haywood played for the ABA's Denver Rockets after a season of junior college and a season at the University of Detroit.
In 1969, Yale University's Jack Langer played for Team United States at the Maccabiah Games in Israel, against the wishes of the NCAA but with the support of Yale's president and Ivy League presidents.
In 1969, the NCAA Council prohibited American college basketball players from participating in the Maccabiah Games for the first time, despite permitting participation in other sports.
On January 15, 1970, the NCAA Council placed Yale University on two-year "full athletic probation" in all sports, restricting Yale teams and athletes from competing in NCAA tournaments and championships.
In February 1970, Representative Robert N. Giaimo spoke in the U.S. Congress regarding the NCAA's actions in the Langer Case.
In 1970, Spencer Haywood signed with the NBA's Seattle SuperSonics before his college class graduation, defying NBA rules.
In 1971, the U.S. Supreme Court ruled that the NBA does not have the same antitrust exemption as Major League Baseball, allowing collegiate players demonstrating economic hardship to enter the NBA draft early.
In 1974, Moses Malone joined the Utah Stars of the American Basketball Association (ABA) directly from high school.
In 1975, the NCAA tournament expanded its field of teams from 25 to 32, increasing interest in the tournament.
In 1976, the hardship requirement for collegiate players seeking early entry into the NBA draft was eliminated.
In 1980, the NCAA tournament expanded its field of teams to 48, further increasing interest in the tournament.
Since 1981, a possession arrow on the scorer's table has dictated which team should possess the ball after a held ball in NCAA basketball.
In 1985, the "Preseason NIT" (later known as the NIT Season Tip-Off) was founded, providing a second NIT tournament played in November.
In 1985, the NCAA tournament expanded its field of teams to 64, again increasing interest and encompassing more of the strongest teams.
From 1992, the NAIA sponsored a Division II championship, similar to the NCAA Division I and II.
In 1992, the NAIA operated separate Division I and Division II men's and women's basketball championships.
In 1994, the NAIA National Tournament was held in Tulsa, Oklahoma.
In 1995, "College basketball data allow for direct comparisons of the racial differences in the marginal revenues generated by players".
In 1999, the NAIA National Tournament was held at Municipal then Kemper Arena in Kansas City.
In 2001, the NAIA National Tournament was held in Tulsa, Oklahoma.
Since 2002, the NAIA National Tournament has been played in Municipal Auditorium in Kansas City, Missouri.
In 2005, the NBA introduced a new dress code rule requiring players to wear business casual attire during team or league business.
In 2005, the NCAA purchased both the postseason NIT and the NIT Season Tip-Off from the Metropolitan Intercollegiate Basketball Association (MIBA), which then disbanded.
In 2006, the NBA required players to be 19 years of age and at least one year removed from high school graduation to be eligible for the draft.
In 2006, the one-and-done rule was implemented in college basketball, changing the NBA draft age and leading players to attend college for a single season before entering the NBA draft. Tyrus Thomas was the first player drafted in the one-and-done era.
In May 2007, the NCAA Rules Committee voted to extend the three-point line by a foot more to 20 feet 9 inches.
Beginning in the 2008–09 season for men, the three-point line was extended to 20 feet 9 inches.
Beginning in the 2011-12 season, the three-point line was extended to 20 feet 9 inches for women's play.
In 2011, the NCAA tournament expanded its field to 68 teams, further increasing the interest, and the distribution of playing locations.
In 2011, with the expansion to 68 teams, the NCAA tournament field changed in that the former first round became the second round, and so on.
In the 2013–14 season, the 10-second rule was added to the women's college game, requiring teams to move the ball past the halfcourt line within 10 seconds.
As of 2015, less than 10% of the coaches in Division III were Black, compared to around 20% in Division II and 25% in Division I.
From the 2015–16 season, NCAA men's coaches were banned from calling timeouts from the bench while the ball is live.
Prior to the 2015–16 season, NCAA men's basketball used a 35-second shot clock.
Since the 2015–16 season, the fifth team foul in a quarter places the team in penalty in NCAA women's basketball.
In 2016, the NCAA tournament's round numbers changed again. The first four games containing the last 8 teams is now referred to as the first four.
In 2017, eight Heartland Conference members announced a mass exodus to the Lone Star Conference effective in 2019.
In the 2017-18 NBA season, the league altered its jersey rules, only requiring that road teams wear colors that sufficiently contrast with the home team's choice, making "color on color" games possible during the regular season.
From the 2015–16 season through 2018–19, NCAA men's coaches were banned from calling timeouts from the bench while the ball is live at any time in the game.
In 2018, eight of the nine Heartland Conference members announced they would leave to join the Lone Star Conference in 2019.
Effective in 2019–20, the NCAA adopted the FIBA three-point arc of 6.75 m at the top of the circle and 6.6 m at the corners and baseline for Division I men's play.
From 2019 to 2020, NCAA men's coaches are allowed to call timeouts during the last 2 minutes of any period (half or overtime).
In 2019, the Heartland Conference disbanded at the end of the 2018–19 school year, with eight members announcing a mass exodus to the Lone Star Conference.
In the 2019-20 season, the NAIA Women's Basketball Championship was split into Divisions I and II.
The 2019-2020 season was the last season that the NAIA operated separate Division I and Division II men's and women's basketball championships.
Effective in 2019–20, the NCAA adopted the current FIBA three-point arc for Division I men's play, with Divisions II and III following in 2020–21.
From 2019 to 2020, coaches are again allowed to call timeouts during the last 2 minutes of any period (half or overtime).
In 2020, basketball divisions in NAIA were abolished after the 2019–20 season, with single men's and women's championships held since then.
In 2020, the American Collegiate Athletic Association merged into the Capital Athletic Conference, with the merged entity renaming itself the Coast to Coast Athletic Conference.
In 2020, the NAIA Men's Basketball National Championship was not held.
In 2020, the NAIA stopped sponsoring a Division II championship.
In 2020, the NCAA tournament was canceled for the first time in its history due to concerns over the COVID-19 pandemic, prioritizing the health and safety of players and spectators.
As of 2021, NCAA men's games are divided into two 20-minute halves.
From 2020 to 2021, the NAIA adopted a single-division format for basketball, with the men's and women's tournaments featuring 64 teams each.
In 2021, Baylor won the Men's NCAA Championship, and Stanford won the Women's NCAA Championship, defeating Arizona in a close game.
In 2021, the NCAA considered granting waivers to winter sport athletes, including basketball players, to regain eligibility for the 2021 season following the cancellation of the 2020 tournament due to the COVID-19 pandemic.
After the 2022–23 season, the Colonial States Athletic Conference and United East Conference merged under the United East banner.
In 2022, Kansas won the Men's NCAA Tournament, defeating North Carolina in the championship, and South Carolina won the Women's NCAA Tournament, defeating UConn.
In 2022, the semifinals and finals of the National Invitation Tournament (NIT) were held at Madison Square Garden for the last time, as since the 1938 tournament, the semifinals and finals were always played in New York City.
As of the 2023–24 college basketball season, there are 23 Division II basketball conferences.
In 2023, LSU's women's team and UConn's men's team won the NCAA national championships, defeating Iowa and San Diego State respectively.
In 2023, the New England Collegiate Conference disbanded, and the Colonial States Athletic Conference and United East Conference merged.
Since 2023, all rounds of the National Invitation Tournament (NIT) are played at various sites across the country, selected annually, ending the tradition of hosting semifinals and finals at Madison Square Garden.
On July 1, 2024, the Big Ten Conference expanded its membership to include four new members, all of which are located in the Pacific Time Zone, marking a shift away from geographic proximity as a primary factor for conference membership.
In August 2024, the Atlantic Coast Conference (ACC) expanded by admitting two new members located in California and one in Texas, indicating a move beyond its original Atlantic Coast footprint.
As of 2024, institutional compatibility is a factor in conference membership. The West Coast Conference is comprised of Christian colleges/universities in the Pacific Time Zone and the Ivy League comprises high-academic institutions.
In 2024, Chicago State became the most recent D-I independent school when it joined the Northeast Conference.
In 2024, a total of 364 schools will play men's basketball in 31 Division I basketball conferences.
In 2024, there are four independent Division II schools without conference affiliations.
The conferences for the 2024–25 season were set.