The Boston Celtics franchise has played in the most NBA Finals since 1947. As of the 2021 NBA season, the Celtics have reached the NBA Finals a total of 21 times. They have a rich history of success and have won the championship title a record 17 times. The Celtics' dominance in the early years of the NBA, particularly during the 1960s, contributed significantly to their appearance in numerous NBA Finals. Their rivalry with the Los Angeles Lakers is one of the most storied in NBA history.
