John Blackwell "Sprat" Cobb was an American college basketball player at the University of North Carolina at Chapel Hill. Cobb is one of eight Tar Heels basketball players who have had their jersey retired, and was nicknamed "Mr. Basketball".

The University of North Carolina at Chapel Hill men's basketball program honors fifty-one former players by hanging their jerseys in the rafters of the Dean E. Smith Center, the home to the men's basketball team on the university's campus. Of these, eight are both honored and retired. However, only seven jersey numbers are retired, as honoree Jack Cobb played before jersey numbers were the norm, meaning he had no number to retire. Justin Jackson and Joel Berry are the most recent players to be honored, following the 2016–17 season. Jackson qualified by being named the ACC Player of the Year and a first-team All-American. Berry was named the Most Outstanding Player of the 2017 Final Four.