The 2020–21 Dallas Mavericks season was the 41st season of the franchise in the National Basketball Association (NBA). The Mavericks clinched the Southwest division for the first time since the 2009-10 season following a 110–90 victory over the Cleveland Cavaliers on May 7, 2021. However, the Mavericks lost in the first round to the Los Angeles Clippers for the second consecutive season in seven games. Following the season on June 17, 2021, long time head coach Rick Carlisle resigned from his position as head coach after 13 seasons and leading the team to a championship in 2011.