The 2021–22 Boston Celtics season was the 76th season of the franchise in the National Basketball Association (NBA). Following the Celtics' first-round exit to the Brooklyn Nets in five games from the previous season, Danny Ainge retired from his role as General Manager, and Brad Stevens was promoted to be the next President of Basketball Operations. The Celtics then hired Brooklyn Nets assistant Ime Udoka as the next head coach on June 28, 2021, in what was his only season as head coach before being suspended for violating team rules in September 2022. Udoka was later replaced permanently midway through the 2022–23 season by Joe Mazzulla, who had been serving as the interim head coach during Udoka's suspension.