Cornelius P. Shea was an American labor leader and organized crime figure. He was the founding president of the International Brotherhood of Teamsters, holding the position from 1903 until 1907. He became involved with the Chicago Outfit, and although he was indicted many times, he usually escaped conviction. After a short prison term for attempted murder removed him from union affairs, Shea was appointed secretary-treasurer of the Mafia-dominated Theatrical Janitors' Union in Chicago.

The International Brotherhood of Teamsters (IBT) is a labor union in the United States and Canada. Formed in 1903 by the merger of the Team Drivers International Union and the Teamsters National Union, the union now represents a diverse membership of blue- and white-collar workers in both the public and private sectors, totalling about 1.3 million members in 2015. The union was formerly called the International Brotherhood of Teamsters, Chauffeurs, Warehousemen and Helpers of America.