Boston Celtics Rookie of the Year winners
3 players
3 players won the Rookie of the Year in a season with the Boston Celtics. They are Larry Bird (1979-80), Dave Cowens (1970-71), and Tom Heinsohn (1956-57).
A winner counts for a club when he played for it in the season he won, the Immaculate Grid's rule. Award lists from Wikipedia. Seasons are on file in full from 1993-94; before that only some of the stars are, so an older name can be missing.