| Jack O'Connor | |
| Position: | Pitcher |
| Bats: | Left |
| Throws: | Left |
| Birth Date: | 2 June 1958 |
| Birth Place: | Yucca Valley, California, U.S. |
| Debutleague: | MLB |
| Debutdate: | April 9 |
| Debutyear: | 1981 |
| Debutteam: | Minnesota Twins |
| Finalleague: | MLB |
| Finaldate: | October 3 |
| Finalyear: | 1987 |
| Finalteam: | Baltimore Orioles |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 14–17 |
| Stat3label: | Strikeouts |
| Stat3value: | 177 |
| Stat2label: | Earned run average |
| Stat2value: | 4.89 |
| Teams: | |
Jack William O'Connor (born June 2, 1958) is an American former Major League Baseball pitcher. He played all or part of six seasons in the majors, between and .