The 2012–13Boston Celtics season was the 67th season of the franchise in the National Basketball Association. The Boston Celtics finished the regular season with a 41–40 won-loss record, which was the 3rd best in the Atlantic division, bringing an end to the 5-year run as Atlantic Champs and 7th best in the East. Their longest winning and losing streaks were 7 and 6 games respectively. The leading scorer was Paul Pierce, averaging 18.6 PPG. The leading rebounder was Kevin Garnett. Rajon Rondo led the team and the league in assists per-game with 11.1 despite only playing 38 games due to ACL injury. The Celtics only played 81 games as their April 16 game against the Indiana Pacers was cancelled in the aftermath of the Boston Marathon bombing and was not rescheduled because it would not have changed any part of the final Eastern Conference standings anyway. The Celtics would go on to lose in the first round of the playoffs to the New York Knicks in six games, marking the first time the Celtics were eliminated in the First Round of the playoffs since the 2004–05 season. This season would mark the end of the Paul Pierce and Kevin Garnett era in Boston as they were traded to the Brooklyn Nets during the 2013 off-season.
October 30: The regular season begins with a 120–107 loss to the Miami Heat in a rematch from the previous season's playoffs.
January 25: Rajon Rondo suffered a partially torn ACL injury in his right knee after a loss to the Atlanta Hawks and will miss the remainder of the season but is expected to be back by training camp for the 2013/14 season.
February 1: Jared Sullinger underwent lumbar disc surgery in his back and will also miss the remainder of the season.
February 11: Leandro Barbosa suffered a torn ACL in his left knee, along with a sprained MCL. He will be out for the rest of the season.
2014 second round draft pick from Brooklyn Brooklyn's own 2014 2nd round pick to Boston. 2015 second round draft pick from Sacramento Sacramento's own 2015 2nd round pick to Boston. If Sacramento's own 2015 2nd round pick is in the top 55 picks, then Sacramento's obligations to Boston shall be extinguished. 2017 second round draft pick from Sacramento Sacramento's own 2017 2nd round pick to Boston. If Sacramento's own 2017 2nd round pick is in the top 55 picks, then Sacramento's obligations to Boston shall be extinguished.
Debits
2013 second round draft pick to Portland Boston's own 2013 2nd round pick to Portland.
Roster
| inj = yesplayer2 | num = 7 | first = Jared | last = Sullinger | pos = PF | ft = 6 | in = 9 | lbs = 260 | college = Ohio State | DOB = 1992-03-04
Regular season
Game log
Note: the Boston Celtics only played 81 games instead of 82 due to the cancellation of the scheduled April 16, 2013 game vs The Indiana Pacers after the Boston Marathon bombing.
