how many finals have the celtics won
exists and is an alternate of . As of 2009, the Boston Celtics have won 17 championships. They hold the title for most championships in the NBA, including 8 championships in a row from 1959- 1966. As of 2009, the Boston Celtics have won 17 championships. They hold the title for most championships in the NBA, including 8 championships in a row from 1959- 1966. The C's won championships for the following seasons: 1956- 1957.