Cleveland Cavaliers All-Stars
15 players
15 players were All-Stars in a season with the Cleveland Cavaliers. LeBron James did it the most, 10 times (2005–2010, 2015–2018). On a roster now: LeBron James, Donovan Mitchell, Kyrie Irving, Darius Garland, and Evan Mobley.
Selections from Wikipedia's list of NBA All-Stars; a player counts for each club he played for that season. Seasons are on file in full from 1993-94; before that only some of the stars are, so an older name can be missing.