| Jack Hardy | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 8 October 1959 |
| Birth Place: | St. Petersburg, Florida |
| Debutleague: | MLB |
| Debutdate: | May 23 |
| Debutyear: | 1989 |
| Debutteam: | Chicago White Sox |
| Finalleague: | MLB |
| Finaldate: | June 2 |
| Finalyear: | 1989 |
| Finalteam: | Chicago White Sox |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–0 |
| Stat2label: | Earned run average |
| Stat2value: | 6.57 |
| Stat3label: | Strikeouts |
| Stat3value: | 4 |
| Teams: | |
John Graydon "Jack" Hardy (born October 8, 1959) is an American former professional baseball player. He was a right-handed pitcher for one season (1989) with the Chicago White Sox of the Major League Baseball (MLB). For his career, he recorded no decisions, with a 6.57 earned run average, and four strikeouts in 12⅓ innings pitched.