The Commissioner of Baseball is the chief executive of Major League Baseball. Under the direction of the commissioner, the Office of the Commissioner of Baseball hires and maintains the sport's umpiring crews, and negotiates marketing, labor, and television contracts. The commissioner is chosen by a vote of the owners of the teams.

The current commissioner is Bud Selig, who has been in office since 1998. Selig previously served as acting commissioner from 1992 to 1998.