The Boston Celtics have reportedly extended head coach Joe Mazzulla on what is believed to be a six-year deal, NBA insider Marc Stein reported on The Stein Line. The team has not officially confirmed the length or financial details, labeling it a multiyear contract extension.
Mazzulla, 37, led the Celtics to their 18th NBA championship in 2024 and has compiled a 182-64 regular season record (.740) and a 33-17 postseason mark (.660) since becoming Boston’s 19th head coach in February 2023.
The Celtics’ president of basketball operations, Brad Stevens, praised Mazzulla’s leadership, citing his consistent regular-season success and elite playoff performance. Mazzulla’s 16-3 playoff run in 2024 marked the second-best postseason winning percentage since 2003.
Despite the team’s 2024-25 campaign ending in a second-round loss to the New York Knicks following Jayson Tatum’s season-ending Achilles injury, Boston remains committed to maintaining coaching continuity.
Mazzulla called the extension “a blessing” and credited his family, the Celtics’ ownership, and his players for the team’s success. At 37, he became the youngest head coach to win an NBA Finals since Bill Russell in 1969.
The reported six-year deal mirrors the pact Brad Stevens signed in 2013 when he transitioned from college basketball to become Boston’s head coach. Coaching circles suggest the length reflects the organization’s long-term confidence in Mazzulla’s leadership and vision.
The extension comes amid a turbulent offseason, which included the franchise being sold to private equity investor William Chisholm for $6.1 billion. The Celtics appear focused on stability, pairing Mazzulla’s coaching prowess with their championship core of players.
With Mazzulla likely locked in through the 2030–31 season, Boston is signaling that it intends to build around its current structure while pursuing another title run in the near future.
