The Boston Celtics with 17 Championships.
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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.
no nba team ever won the world series --------------------- Assuming that the question is actually "What team has won the most NBA Championships", the answer is the Boston Celtics with 16. No one else is in double digits (unless you add the 9 by the LA Lakers to the 6 of their predecessor team, the Minneapolis Lakers).