Since 1957, the Celtics have reached the NBA Finals 21 times and won 17 championships.
21. They have won 17 of them.
The Celtics went to the Finals 20 times losing ONLY 3 times.
the lakers and celtics met in the NBA finals eleven times.
the lakers have been there 30 times and the celtics have been there 38 times
about 16 times
The Los Angeles Lakers lost to the Boston Celtics in the NBA finals 8 times.
They reached the finals five times and won three of those times.
3 times as of the year 2009.
He has been to 7 NBA Finals in: 2000,2001,2002,2004,2008,2009,2010. He lost against the Detroit Pistons in 2004 and Boston Celtics in 2008.