Creation and merger
The Basketball Association of America was founded in 1946 by owners of the major
ice hockey arenas in the
Midwestern United States and Canada. On November 1, 1946, in
Toronto, Ontario, Canada, the
Toronto Huskies hosted the
New York Knickerbockers at
Maple Leaf Gardens, in a game the NBA now refers to as the first played game in NBA history.
 The first basket was made by
Ossie Schectman of the Knickerbockers. Although there had been earlier attempts at professional basketball leagues, including the
American Basketball League and the NBL, the BAA was the first league to attempt to play primarily in large arenas in major cities. During its early years, the quality of play in the BAA was not significantly better than in competing leagues or among leading independent clubs such as the
Harlem Globetrotters. For instance, the 1948 ABL finalist
Baltimore Bullets moved to the BAA and won that league's 1948 title, and the 1948 NBL champion
Minneapolis Lakers won the 1949 BAA title. Prior to the 1948–49 season, however, NBL teams from Fort Wayne, Indianapolis, Minneapolis, and Rochester jumped to the BAA, which established the BAA as the league of choice for collegians looking to turn professional.
On August 3, 1949, the remaining NBL teams–Syracuse, Anderson, Tri-Cities, Sheboygan, Denver, and Waterloo–merged into the BAA. In deference to the merger and to avoid possible legal complications, the league name was changed to the present National Basketball Association, even though the merged league retained the BAA's governing body, including Podoloff.
 To this day, the NBA claims the BAA's history as its own. It now reckons the arrival of the NBL teams as an expansion, not a merger, and does not recognize NBL records and statistics.
The new league had seventeen franchises located in a mix of large and small cities,
 as well as large arenas and smaller gymnasiums and armories. In 1950, the NBA consolidated to eleven franchises, a process that continued until 1953–54, when the league reached its smallest size of eight franchises: the
New York Knicks,
Fort Wayne Pistons,
Tri-Cities Blackhawks, and
Syracuse Nationals, all of which remain in the league today. The process of contraction saw the league's smaller-city franchises move to larger cities. The Hawks shifted from the
Milwaukee in 1951, and then to
St. Louis in 1955. The Rochester Royals moved from
Rochester, New York, to
Cincinnati in 1957 and the Pistons relocated from
Fort Wayne, Indiana, to
Detroit in 1957.
Wataru Misaka broke the
NBA color barrier in the
1947–48 season when he played for the
New York Knicks. He remained the only non-white player in league history prior to the first African-American,
Harold Hunter, signing with the
Washington Capitols in 1950.
 Hunter was cut from the team during training camp,
 but several African-American players did play in the league later that year, including
Chuck Cooper with the Celtics,
Nathaniel "Sweetwater" Clifton with the Knicks, and
Earl Lloyd with the
Washington Capitols. During this period, the Minneapolis Lakers, led by center
George Mikan, won five
NBA Championships and established themselves as the league's first
 To encourage shooting and discourage stalling, the league introduced the 24-second
shot clock in 1954.
 If a team does not attempt to score a field goal (or the ball fails to make contact with the rim) within 24 seconds of obtaining the ball, play is stopped and the ball given to its opponent.
Celtics' dominance, league expansion and competition
In 1957, rookie center
Bill Russell joined the
Boston Celtics, which already featured guard
Bob Cousy and coach
Red Auerbach, and went on to lead the club to eleven NBA titles in thirteen seasons. Center
Wilt Chamberlain entered the league with the Warriors in 1959 and became a dominant individual star of the 1960s, setting new single game records in scoring (
100) and rebounding (55).
Russell's rivalry with Chamberlain became one of the greatest rivalries in the history of American team sports.
The 1960s were dominated by the Celtics. Led by Russell, Bob Cousy and coach Red Auerbach, Boston won eight straight championships in the NBA from 1959 to 1966. This championship streak is the longest in NBA history. They did not win the title in
1966–67, but regained it in the
1967–68 season and repeated in
1969. The domination totaled nine of the ten championship banners of the 1960s.
Through this period, the NBA continued to evolve with the shift of the
Minneapolis Lakers to Los Angeles, the
Philadelphia Warriors to San Francisco, the
Syracuse Nationals to
Philadelphia to become the
Philadelphia 76ers, and the
St. Louis Hawks moving to
Atlanta, as well as the addition of its first expansion franchises. The Chicago Packers (now
Washington Wizards) became the ninth NBA team in 1961. From 1966 to 1968, the league expanded from 9 to 14 teams, introducing the
Seattle SuperSonics (now
Oklahoma City Thunder),
San Diego Rockets (who relocated to
Houston four years later),
Milwaukee Bucks, and
In 1967, the league faced a new external threat with the formation of the
American Basketball Association (ABA). The leagues engaged in a bidding war. The NBA landed the most important college star of the era,
Kareem Abdul-Jabbar (then known as Lew Alcindor). However, the NBA's leading scorer,
Rick Barry, jumped to the ABA, as did four veteran referees—
Earl Strom, John Vanak, and Joe Gushue.
Alan Siegel, who oversaw the design of Jerry Dior's
Major League Baseball logo a year prior, created the modern NBA logo inspired by the MLB's. It incorporates the silhouette of the legendary
Jerry West based on a photo by Wen Roberts, although NBA officials denied a particular player as being its influence because, according to Siegel, "They want to institutionalize it rather than individualize it. It's become such a ubiquitous, classic symbol and focal point of their identity and their licensing program that they don't necessarily want to identify it with one player." The iconic logo debuted in 1971 (with a small change to the typeface on the NBA wordmark in 2017) and would remain a fixture of the NBA brand.
The ABA succeeded in signing a number of major stars in the 1970s, including
Julius Erving of the
Virginia Squires, in part because it allowed teams to sign college undergraduates. The NBA expanded rapidly during this period, one purpose being to tie up the most viable cities. From 1966 to 1974, the NBA grew from nine franchises to 18. In 1970, the
Portland Trail Blazers,
Cleveland Cavaliers, and Buffalo Braves (now the
Los Angeles Clippers) all made their debuts expanding the league to 17.
 The New Orleans Jazz (now in
Utah) came aboard in 1974 bringing the total to 18. Following the 1976 season, the leagues reached a
settlement that provided for the addition of four ABA franchises to the NBA, raising the number of franchises in the league at that time to 22. The franchises added were the
San Antonio Spurs,
Indiana Pacers, and
New York Nets (now the Brooklyn Nets). Some of the biggest stars of this era were
Dan Issel, and
Pete Maravich. The end of the decade, however, saw declining TV ratings, low attendance and drug-related player issues – both perceived and real – that threatened to derail the league.
The league added the ABA's innovative
three-point field goal beginning in 1979 to open up the game. That same year, rookies
Larry Bird and
Magic Johnson joined the
Boston Celtics and
Los Angeles Lakers respectively, initiating a period of significant growth in fan interest in the NBA throughout the country and the world. The two had faced each other in the
1979 NCAA Division I Basketball Championship Game, and they would later play against each other in three NBA Finals (1984, 1985 and 1987, featuring 11 players and coaches who would later be inducted to the
Basketball Hall of Fame). Like the 1960s, when the Celtics and Lakers faced each other in six NBA Finals, the two teams again dominated the NBA. In the 10 seasons of the 1980s, Johnson led the Lakers to five titles in eight Finals while Bird led the Celtics to three titles in five Finals. Also in the early 1980s, the NBA added one more expansion franchise, the
Dallas Mavericks, bringing the total to 23 teams. Later on, Larry Bird won the first three three-point shooting contests. Former league commissioner
David Stern, who took office on February 1, 1984, oversaw the expansion and growth of the NBA to a global commodity.
Michael Jordan entered the league in 1984 with the
Chicago Bulls, providing an even more popular star to support growing interest in the league. This resulted in more cities demanding teams of their own. In 1988 and 1989, four cities got their wishes as the
Orlando Magic, and
Minnesota Timberwolves made their NBA debuts, bringing the total to 27 teams. In the first year of the 1990s, the
Detroit Pistons would win the second of their back-to-back titles, led by coach
Chuck Daly and guard
Isiah Thomas. Jordan and
Scottie Pippen would lead the Bulls to two three-peats in eight years during the 1991–98 seasons.
Hakeem Olajuwon won back-to-back titles with the
Houston Rockets in 1994 and 1995.
1992 Olympic basketball
Dream Team, the first to use current NBA stars, featured Michael Jordan as the anchor, along with Bird, Johnson,
Patrick Ewing, Scottie Pippen,
Charles Barkley, and star NCAA amateur
Christian Laettner. The team was elected to the
Naismith Memorial Basketball Hall of Fame, while 11 of the 12 players on the roster (all but Laettner) and three of the four coaches have been elected to the Hall of Fame as individuals.
In 1995, the NBA expanded to Canada with the addition of the
Vancouver Grizzlies and the
Toronto Raptors. In 2001, the Vancouver Grizzlies
Memphis, which left the Raptors as the only Canadian team in the NBA.
In 1996, the NBA created a women's league, the
Women's National Basketball Association (WNBA).
In 1998, the NBA owners began a
lockout which lasted 191 days and was settled on January 18, 1999. As a result of this lockout the
1998–99 NBA season was reduced from 82 to 50 games (61% of a normal season), and the All-Star Game was cancelled. The
San Antonio Spurs won their first championship, and first by a former ABA team, by beating the
New York Knicks, who were the first, and are the only, eighth seed to ever make it to the NBA Finals.
Since the breakup of the
Chicago Bulls championship roster in the summer of 1998, the
Western Conference has dominated, with the
Los Angeles Lakers and
San Antonio Spurs combining to win the title nine out of fourteen seasons.
Tim Duncan and
David Robinson won the
1999 championship with the
Shaquille O'Neal and
Kobe Bryant started the 2000s with three consecutive championships for the Lakers. The Spurs reclaimed the title in
2003 against the
Nets. In 2004, the Lakers returned to the
Finals, only to fall in five games to the
After the Spurs took home the
Larry O'Brien Championship Trophy in
2006 Finals featured two franchises making their inaugural Finals appearances. The
Miami Heat, led by their star shooting guard,
Dwyane Wade, and Shaquille O'Neal, who had been traded from the Lakers during the 2004 summer, won the series over the
Dallas Mavericks in six after losing the first two games. The Lakers/Spurs dominance continued in 2007 with a four-game sweep by the Spurs over the
Cleveland Cavaliers, who were led by
LeBron James. The
2008 Finals saw a rematch of the league's
highest profile rivalry, the
Boston Celtics and
Los Angeles Lakers, with the Celtics winning, for their 17th championship, thanks to their new big three of
Ray Allen, and
In 2009, Kobe Bryant and the Lakers returned to the
Finals, this time defeating the
Orlando Magic. Bryant won his first
Bill Russell NBA Finals Most Valuable Player Award in his 13th season after leading the Lakers to their first NBA championship since the departure of Shaquille O'Neal.
2010 NBA All-Star Game was held at
Cowboys Stadium in front of the largest crowd ever, 108,713.
 At the end of that season, the Celtics and the Lakers renewed their rivalry from
2008 when they met again in the NBA Finals for a record 12th time. The Lakers won the title by winning Game 7, 83–79.
 Before the start of the 2010–11 season the NBA had an exciting summer with one of the most anticipated free agent classes of all time. Two of which signed, and one resigned, with the Miami Heat, leading to a season that was heavily centered on their eventual success or failure at taking home the championship. The Heat, led by LeBron James, Dwyane Wade, and
Chris Bosh, did in fact make the Finals against the Dallas Mavericks, in a rematch for the franchises of the 2006 Finals. The Mavericks, led by
Dirk Nowitzki (the eventual NBA Finals MVP), took the series in six games. This was the Mavericks' first title. Veterans
Jason Terry, and
Peja Stojaković celebrated their first NBA championship.
On July 1, 2011, at 12:01 am, the NBA announced
 After the first few weeks of the season were canceled, the players and owners ratified a new collective bargaining agreement on December 8, 2011, setting up a shortened 66-game season.
 Following the shortened season, the Miami Heat made a return to the Finals with the trio of Dwyane Wade, LeBron James, and Chris Bosh against
Oklahoma City Thunder's
Russell Westbrook, and
James Harden. The Heat went on to defeat the Thunder in five games, capturing their second NBA title in six years. Their success would continue into the following season, which concluded with their victory over the San Antonio Spurs in the
2013 NBA Finals. The two teams would meet for a rematch in the following year's Finals, where the Spurs defeated the Heat in five games. Off the court, commissioner David Stern retired on February 1, 2014, exactly 30 years to the day from taking office. He was succeeded by his deputy,
Following the 2014 Finals, LeBron James announced that he would return to the
Cleveland Cavaliers. James led the Cavaliers to their second Finals appearance, where they fell to the
Golden State Warriors in six games. The following year, in a rematch, the
2016 NBA Finals concluded with the Cavaliers defeating the Warriors in seven games to win their first NBA Championship. The dominance of those two teams continued in 2017, when the Warriors, having signed Durant as a free agent, took the third straight Finals matchup between the clubs in five games, with Durant named Finals MVP.
Following pioneers like
Vlade Divac (
Dražen Petrović (
Croatia) who joined the NBA in the late 1980s, an increasing number of international players have moved directly from playing elsewhere in the world to starring in the NBA. Since 2006, the NBA has faced
in exhibition matches in the
NBA Europe Live Tour, and since 2009, in the
EuroLeague American Tour. The
2013–14 season opened with a record 92 international players on the opening night rosters, representing 39 countries and comprising over 20% of the league
In 2001, an affiliated
minor league, the National Basketball Development League, now called the
NBA G League, was created.
 Before the league was started, there were strong rumors that the NBA would purchase the
Continental Basketball Association, and call it its developmental league.
Two years after the Hornets' relocation to
New Orleans, the NBA returned to North Carolina, as the
Charlotte Bobcats were formed as an
expansion team in 2004.
temporarily relocated to
Oklahoma City in 2005 for two seasons because of damage caused by
Hurricane Katrina. The team returned to New Orleans in 2007.
A new official game ball was introduced on June 28, 2006, for the 2006–07 season, marking the first change to the ball in over 35 years and only the second ball in 60 seasons.
 Manufactured by
Spalding, the new ball featured a new design and new synthetic material that Spalding claimed offered a better grip, feel, and consistency than the original ball. However, many players were vocal in their disdain for the new ball, saying that it was too sticky when dry, and too slippery when wet.
Commissioner Stern announced on December 11, 2006, that beginning January 1, 2007, the NBA would return to the traditional leather basketball in use prior to the 2006–07 season. The change was influenced by frequent player complaints and confirmed hand injuries (cuts) caused by the microfiber ball.
Players' Association had filed a suit in behalf of the players against the NBA over the new ball.
 As of the 2017–18 season, the NBA team jerseys are manufactured by
Nike, replacing the previous supplier,
Adidas. All teams will wear jerseys with the Nike swoosh logo except the
Charlotte Hornets, whose jerseys will instead bear the
Jumpman logo associated with longtime Nike endorser
Michael Jordan, who owns the Hornets.
Federal Bureau of Investigation (FBI) began an investigation on July 19, 2007, over allegations that veteran NBA referee
Tim Donaghy bet on basketball games he officiated over the past two seasons and that he made calls affecting the
point spread in those games.
 On August 15, 2007, Donaghy pleaded guilty to two federal charges related to the investigation. However, he could face additional charges if it is determined that he deliberately miscalled individual games. Donaghy claimed in 2008 that certain refs were friendly with players and "company men" for the NBA. Donaghy alleged that refs influenced the outcome of certain playoff and finals games in 2002 and 2005. NBA commissioner
David Stern denied the allegations and said Donaghy was a convicted felon and a "singing, cooperating witness".
 Donaghy served 15 months in prison and was released in November 2009.
 According to an independent study by Ronald Beech of Game 6 of the
2002 Western Conference Finals between the Los Angeles Lakers and Sacramento Kings, although the refs increased the Lakers' chances of winning through foul calls during the game, there was no
collusion to fix the game. On alleged "star treatment" during Game 6 by the refs toward certain players, Beech claimed, "there does seem to be issues with different standards and allowances for different players."
The NBA Board of Governors approved the request of the
Seattle SuperSonics to
relocate to Oklahoma City on April 18, 2008.
 The team, however, could not move until it had settled a lawsuit filed by the city of
Seattle, which was intended to keep the SuperSonics in Seattle for the remaining two seasons of the team's lease at
KeyArena. Following a court case, the city of Seattle settled with the
ownership group of the SuperSonics on July 2, 2008, allowing the team to move to Oklahoma City immediately in exchange for terminating the final two seasons of the team's lease at KeyArena.
Oklahoma City Thunder began playing in the 2008–09 season.
The first outdoor game in the modern era of the league was played at the
Indian Wells Tennis Garden on October 11, 2008, between the
Phoenix Suns and the
A referee lockout began on September 1, 2009, when the contract between the NBA and its referees expired. The first preseason games were played on October 1, 2009, and replacement referees from the
NBA Development League were used, the first time replacement referees had been used since the beginning of the 1995–96 season. The NBA and the regular referees reached a deal on October 23, 2009.
The first official NBA league games on European ground took place in 2011. In two matchups, the
New Jersey Nets faced the
Toronto Raptors at the
O2 Arena in London in front of over 20,000 fans.
The NBA laid off around 114 league employees—about 11 percent of all the league office workforce—in July 2011 to save money.
2011–12 NBA season, scheduled to begin November 1, 2011, with a matchup between the defending champion Dallas Mavericks and the Chicago Bulls, was
postponed due to a labor dispute. The lockout officially ended on December 8, 2011, when players and owners ratified a new collective bargaining agreement, and the season began on Christmas Day.
The New Jersey Nets officially changed their name to the
Brooklyn Nets on April 30, 2012.
 They began playing in the New York City
Brooklyn in the 2012–13 season.
The NBA announced in October 2012 that it would begin fining players for
After the 2012–13 season, the New Orleans Hornets renamed themselves the
 During the 2013–14 season, Stern retired as commissioner after 30 years, and deputy commissioner
Adam Silver ascended to the position of commissioner. During that season's playoffs, the Bobcats officially reclaimed the Hornets name, and by agreement with the league and the Pelicans, also received sole ownership of all history, records, and statistics from the Pelicans' time in Charlotte. As a result, the Hornets are now officially considered to have been founded in 1988, suspended operations in 2002, and resumed in 2004 as the Bobcats, while the Pelicans are officially treated as a 2002 expansion team.
 (This is somewhat similar to the relationship between the
Cleveland Browns and
Baltimore Ravens in the
Donald Sterling, who was then-owner of the
Los Angeles Clippers, received a lifetime ban from the NBA on April 29, 2014, after racist remarks he made became public. Sterling was also fined US$2.5 million, the maximum allowed under the NBA Constitution.
Becky Hammon was hired by the
San Antonio Spurs on August 5, 2014, as an assistant coach, becoming the second female coach in NBA history but the first full-time coach.
 This also makes her the first full-time female coach in any of the
four major professional sports in North America.
The NBA announced on April 15, 2016, that it would allow all 30 of its member clubs to sell corporate sponsor advertisement patches on official game uniforms, beginning with the 2017–18 season. The sponsorship advertisement patches would appear on the left front of jerseys, opposite
Nike's logo, marking the first time a manufacturer's logo would appear on NBA jerseys, and would measure approximately 2.5 by 2.5 inches. The NBA would become the first
major North American professional sports league to allow corporate sponsorship logos on official team uniforms, and the last to have a uniform manufacturer logo appear on its team uniforms.
 The first team to announce a jersey sponsorship was the
Philadelphia 76ers, who agreed to a deal with
On July 6, 2017, the NBA unveiled an updated rendition of its logo; it is largely identical to the previous design, except with revised typography and a "richer" color scheme. The league began to phase in the updated logo across its properties during the
2017 NBA Summer League, but it will not immediately be used on equipment or uniforms due to
The NBA also officially released new
Nike uniforms for all 30 teams for the 2017–18 season. In the press release, the league stated it would do away with "home" and "away" uniform designations. Instead, each team would have four uniforms: the "Association" edition, which is the team's traditional white uniform, the "Icon" edition, which is the team's primary color uniform, and two other uniform editions, to be unveiled at a later date.