Thomas Mitchell Herr (born April 4, 1956) is an American former professional baseball second baseman, who played in Major League Baseball (MLB) for the St. Louis Cardinals, Minnesota Twins, Philadelphia Phillies, San Francisco Giants, and New York Mets, from 1979 to 1991.

[3] Herr played in the 1982, 1985, and 1987 World Series – all with the Cardinals, finishing fifth in the MVP voting and making his only appearance in the All-Star Game in 1985.

His success in Lancaster piqued the interest of the Washington Nationals, resulting in a managerial position with the Single-A Hagerstown Suns for the 2007 season.

Following the 2007 season, Herr left the Nationals organization after his request to manage their Double-A affiliate, the Harrisburg Senators, was refused.

After leaving the Nationals, he sought employment with other major league organizations, including the St. Louis Cardinals, without success.