Jack O'Brien boxer
- bouts
- 9
- won
- 4
- lost
- 5
- draw
- 0
- Status
- inactive
- Division
- welterweight
- Debut
- 1957-12-07
- Height
- -
- Reach
- -
- Age
- -
- Born
- 1939-02-19
- Death
- -
- Nationality
- United Kingdom
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1959-05-09 | Gerry O'Neill | WLLWDL | Belfast | LOST KO |
| 1959-04-04 | Bobby Griffin | WWDLLW | Ulster Hall, Belfast | WIN Points |
| 1959-03-28 | Gerry O'Neill | DWLLWD | Belfast | WIN Points |
| 1959-02-14 | Tommy Houston | WLWLLD | Ulster Hall, Belfast | WIN Points |
| 1959-02-06 | Tommy Larmour | WWLWDL | Belfast | WIN Points |
| 1958-06-21 | Tommy Larmour | LLLWDW | Belfast | LOST KO |
| 1958-01-11 | Jim Loughans | LLLW | Ulster Hall, Belfast | LOST KO |
| 1957-12-21 | Ray Bond | WL | Ulster Hall, Belfast | LOST Corner retirement |
| 1957-12-07 | Bobby Griffin | WW | Belfast | LOST KO |