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Thomas William Heinsohn (August 26, 1934 – November 9, 2020) was an American professional basketball player and coach. He was associated with the Boston Celtics of the National Basketball Association (NBA) for six decades as a player, coach and broadcaster. He played for the Celtics from 1956 to 1965, and also coached the team from 1969 to 1978. He spent over 30 years as the color commentator for the Celtics' local broadcasts alongside play-by-play commentator Mike Gorman. He is regarded as one of the most iconic Celtics figures in the franchise's history, known during his lifetime for his charisma and loyalty to the team and its traditions. From this, he earned the nickname "Mr. Celtic".
Heinsohn was inducted into the Naismith Memorial Basketball Hall of Fame for his contributions as a player. He was also inducted into the Hall of Fame for his success as a head coach. He also helped form the NBA Players Association. Heinsohn was the only person to have the distinction of being involved in an official team capacity in each of the Celtics' 17 championships, as well as each of their first 21 NBA Finals appearances.