| Team: | Dallas Mavericks |
| End Year: | 2009 |
| Wins: | 50 |
| Losses: | 32 |
| Division: | Southwest |
| Division Place: | 3 |
| Conf Place: | 6 |
| Coach: | Rick Carlisle |
| Gm: | Donnie Nelson |
| President: | Donnie Nelson |
| Owner: | Mark Cuban |
| Arena: | American Airlines Center |
| Playoffs: | Conference Semifinals (lost to Nuggets 1–4) |
| Bbr Team: | DAL |
| Television: | |
| Radio: | KESN |
The 2008–09 Dallas Mavericks season was the 29th season of the franchise in the National Basketball Association (NBA). The season marked by the arrival of former NBA Coach of the Year, Rick Carlisle who was hired on May 9, 2008 following the firing of Avery Johnson after the 2008 NBA playoffs.
Finishing at 50–32 as the number six seed, the Mavericks defeated the San Antonio Spurs in the opening round of the playoffs in five games to advance to the conference semi-finals for the first time since 2006. They were, however, unable to defeat the Carmelo Anthony-led Denver Nuggets in the next round as they lost in five games. The Nuggets would go on to the conference finals, where they lost to the eventual champion Los Angeles Lakers in six games.
See main article: 2008 NBA draft.