The ceremony is scheduled for Jan. 20, before the team hosts the Pacers. Mullin, an ESPN anaylyst who was enshrined in the Hall of Fame last month, played his first 12 seasons with Golden State, then three with Indiana before returning to the Warriors for his final season in 2000-01.
Owner Joe Lacob made the announcement Wednesday night at an event for season ticket-holders. Mullin will become the sixth player in franchise history to have his jersey number retired, joining Al Attles, Rick Barry, Wilt Chamberlain, Tom Meschery and Nate Thurmond.
Mullin finished with 17,911 points in 986 games.
Information from The Associated Press was used in this report.