John Thomas Krol
- Bats Right, Throws Right
- Height 5' 11", Weight 175 lb.
Jack Krol was a St. Louis Cardinals coach from 1977 to 1980, serving as the club's interim manager briefly in 1978 and in 1980. He was then a member of the San Diego Padres coaching staff from 1981 to 1986. After managing in the Padres' chain from 1987 to 1990, he was an advance scout for the Cardinals in 1991.
In 18 seasons as a minor league manager, he posted a 1,135-1,131 lifetime record.