The Boston Celtics' jersey number history is vast, featuring a remarkable 68 different jersey numbers worn by over 500 players since the franchise's inception in 1946. Among these, only 25 jerseys have been retired, honoring some of the greatest talents to grace the hardwood. The jersey number 20 is notable for being worn by Lou Tsioropoulos, who played for the Celtics from 1956 to 1959 after being drafted from the University of Kentucky. Tsioropoulos, a center from Lynn, Massachusetts, became a part of the fabric of Celtics history during his short but impactful career.

Tsioropoulos wore the number 20 exclusively throughout his time with the Celtics, contributing to a legacy that saw the team rise to prominence in the NBA. His journey from college to professional basketball illustrates the pathway many athletes aspire to, and he remains a cherished figure in the annals of Celtics lore.