Jack O'Brien boxer
- bouts
- 13
- won
- 3
- lost
- 10
- draw
- 0
- Status
- inactive
- Division
- light heavyweight
- Debut
- 1931-03-02
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- United Kingdom
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1934-12-12 | Bushman Dempster | LLWLLW | The Ring, Belfast | WIN Points |
| 1934-10-18 | Cock Moffitt | WWLWWW | The Stadium, Liverpool | LOST Technical knockout |
| 1934-07-07 | Manuel Kid Abrew | WWLWLL | Grosvenor Park, Belfast | LOST Points |
| 1934-05-24 | Charlie Parkin | WWWWWL | The Stadium, Liverpool | LOST Points |
| 1934-02-09 | Paul Schaeffer | WLLWW | The Ring, Belfast | WIN Points |
| 1933-07-29 | Tommy Farr | WWWWWW | Grosvenor Park, Belfast | LOST Technical knockout |
| 1933-03-18 | Jim Berry | WWLWWL | South Shields | LOST Points |
| 1932-01-06 | Paul McGuire | WWWLWL | Ulster Hall, Belfast | LOST |
| 1931-07-19 | Jock McAvoy | WWWWWW | Tolka Park, Dublin | LOST Technical knockout |
| 1931-05-26 | Rex Cartwright | WWWW | Winter Gardens, Southport | WIN Technical knockout |
| 1931-03-22 | Jack Kid Casey | LLLWWW | National Sporting Club, Leeds | LOST Technical knockout |
| 1931-03-17 | Jack Kid Casey | LLLLWW | Free Trade Hall, Manchester | LOST Technical knockout |
| 1931-03-02 | Jack Kid Casey | WWLLLL | Town Hall, Leeds | LOST Points |