The Celtics have won the Championship 17 times...
The Celtics won in the year 1957.
The Boston Celtics defeated the Houston Rockets, 4 games to 2, to win the 1981 NBA championship.
The Celtics won their championship in Game 6 at the TD Banknorth Garden.
the coach of the boston celtics last time they had a championship is Doc Rivers
They won it in 2008.