The Celtics last championship came in the 1985-1986 season. answer actually the celtics last won during the 2007-2008 season winning their 17th championchip
in the 2007-2008 season
The Celtics have won the Championship 17 times...
Celtics won 17 NBA Championship.
The Celtics won in the year 1957.
the coach of the boston celtics last time they had a championship is Doc Rivers