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 later a member of the San Diego Padres coaching staff from 1981 to 1986.
In 18 seasons as a minor league manager, he posted a 1,135-1,131 lifetime record.