Jules C. Stein (April 26, 1896 – April 29, 1981) was an American physician and businessman who co-founded Music Corporation of America (MCA).
Stein was born in South Bend, Indiana to Lithuanian Jewish immigrants, one of six children (three boys and three girls) of Louis Stein, a dry goods store owner, and Rosa Cohen (née Kahanaski). In 1915, he graduated from the University of Chicago. While in college, he supported himself by playing the violin and saxophone at weddings and bar mitzvahs; and later, realizing that he was not a very good musician, by organizing dance bands for the same events. In 1921, he graduated with a medical degree from Rush Medical College. He then went to the University of Vienna to study for a year and upon returning to Chicago, he was appointed chief resident at Cook County Hospital. Stein continued to book bands on the side and eventually left his secure life as an ophthalmologist for the entertainment industry. At the time, Chicago was a hotbed for jazz—which had recently displaced ragtime as the popular music—and when combined with Prohibition, created a lucrative environment for entertainment. Stein adjusted to the new landscape and shifted from booking bands for weddings to nightclubs. Stein became very successful. Several of his bands played for speakeasies owned by Al Capone with whom Stein was friends.