Mark Anthony Eichhorn (born November 21, 1960) is an American former Major League Baseball pitcher best known for his tenure with the Toronto Blue Jays in the late 1980s and the early 1990s when he often served as a middle reliever/set-up man for All-Star closer Tom Henke.

The shoulder injury had robbed Eichhorn of most of his fastball velocity and had forced him to turn to an unconventional sidearm motion in which his arm angle was well below the belt when he released the ball.

Eichhorn was notable for an exceptionally low velocity for a major league pitcher though his control and unusual delivery made him an effective player.

[1] Eichhorn pitched with four different ballclubs during his career: the Toronto Blue Jays (1982, 1986–1988, 1992–1993), Atlanta Braves (1989), California Angels (1990–1992, 1996), and Baltimore Orioles (1994).

On January 24, 2011, Kevin was traded to the Detroit Tigers organization in a deal for pitcher Armando Galarraga, pitching through the 2014 season, finishing with a career mark of 26-23 and a 3.73 ERA in 89 games.