MarketList of all-time NBA win–loss records
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List of all-time NBA win–loss records

The National Basketball Association (NBA) was founded in 1946 and began operations as the Basketball Association of America (BAA). In 1949, the BAA merged with the National Basketball League (NBL), absorbing the latter's teams and rebranding as the NBA; the 1949–50 NBA season marked the first following the merger. NBA win–loss records include the wins and losses recorded during a team's playing time in the BAA. Defunct BAA/NBA franchises are also accounted for. However, NBA win–loss record do not include the wins and losses recorded during a team's playing time in the American Basketball Association (ABA), despite the 1976 ABA–NBA merger.

Active franchises
Regular season Play-in tournament led the Portland Trail Blazers to the first play-in tournament victory in NBA history.|390x390px During the 2020 NBA Bubble, the NBA introduced a play-in tournament in the 2019–20 NBA season to compensate for the suspension of the regular season and a difference in the number of games played between teams, as a result of the COVID-19 pandemic. For the 2019–20 NBA season, if a conference's 9th-place team was within 4 games back of the 8th-place team in the standings, a play-in matchup between the two seeds would be triggered. To clinch the 8th seed in the playoffs, the 8th-place team would need to win one game, while the 9th-place team would need to win two in the matchup. Due to the success of the NBA play-in tournament and the COVID-19 pandemic persisting into the 2020–21 NBA season, the league installed a NBA play-in tournament involving both conference's 7th-place through 10th-place teams in the standings upon the end of the regular season, without regard to games back. The format of the NBA play-in tournament, still in place as of the 2026 season, involves the 7th-place team plays a home game against the 8th-place team, with the winner clinching the 7th seed in their respective conference's playoff bracket. Meanwhile, the 9th-place team plays a home game against the 10th-place team, with the loser being eliminated from playoffs contention. Then, the winner of the 9th-10th place team plays on the road, visiting the loser of the 7th-8th place matchup. The winner of this game clinches the 8th seed, with the loser being eliminated. 24 teams of the NBA's 30 teams have played at least one play-in game; the 6 teams yet to participate are the Utah Jazz, Milwaukee Bucks, Houston Rockets, Denver Nuggets, New York Knicks and Detroit Pistons. Playoffs ==Defunct franchises==
Defunct franchises
17 BAA/NBA franchises are now defunct, although only 15 played games. Amongst defunct franchises, the Chicago Stags have the highest win–loss record percentage, with (). The Denver Nuggets have the lowest win–loss record percentage, with (). The Baltimore Bullets have the most games played (450), wins (158) and losses (292) for a defunct NBA franchise. The Cleveland Rebels, Toronto Huskies, Detroit Falcons, Indianapolis Jets and Pittsburgh Ironmen are all tied for fewest games played (60). Only teams that recorded playing time in the BAA/NBA are included, as the NBA does not recap NBL statistics nor does it officially count ABA statistics. Regular season Playoffs ==See also==
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