John Thomas Krol (July 5, 1936 – May 30, 1994) was an American coach and manager in Major League Baseball. Primarily a second baseman and shortstop, the right-handed hitting and throwing Krol never reached the Major Leagues during his playing career (1954–66). The native of Chicago, Illinois, spent most of that period in the St. Louis Cardinals farm system, and became a playing manager in 1966 with the Rock Hill, South Carolina, franchise of the Class A Western Carolinas League.