There have been multiple persons named Jack O'Connor in major league history:
- Jack O'Connor (o'conja01) - John Joseph O'Connor, catcher from 1887-1910 and manager
- Jack O'Connor (o'conja02) - Jack William O'Connor, pitcher from 1981-1987
Disambiguation Pages are for subjects or titles that might refer to multiple possible BR Bullpen subjects. If your link directed you to this page, you may want to update it to one of the pages above.