List of Major League Baseball umpires

The following is a list of major league baseball umpires. The list includes umpires who worked in any of four 19th century major leagues (American Association, National Association, Players' League, Union Association), one defunct 20th century major league (Federal League), the currently active Major League Baseball, or either of its leagues (American League, National League) when they maintained separate umpiring staffs.
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Major League Umpires.
Key.
 denotes umpires who were former major league players<br>
 denotes umpires who were "active" players (emergency substitutes)