celtics won 17 champoinships there first won was in 1957
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Cleveland Cavaliers
The Boston Celtics have won the most NBA Finals and thus the most NBA championships with 17.
Celtics with 17
The Boston Celtics. They have won 17 times.The NBA teams that has won the most finals or with the most titles is the The Boston Celtics.
THe celtics have won more than 20 nba titles.