Once. The Celtics defeated the Los Angeles Lakers in six games to win the 2007-2008 NBA title.
The Celtics played a total of 122 championship games. Their win-loss record is 74-48.
The Boston Celtics have won 17 NBA titles.
The Boston Celtics have won 17 NBA championships.
The Celtics won in the year 1957.
The Boston Celtics have won the NBA Championship 17 teams, the most by any team.