Jack O'Brien boxer
- bouts
- 64
- won
- 40
- lost
- 16
- draw
- 8
- Status
- inactive
- Division
- middleweight
- Debut
- 1921-12-10
- Height
- 5′ 8″/173cm
- Reach
- -
- Age
- -
- Born
- 1913-01-01
- Death
- -
- Nationality
- Australia
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1937-07-16 | Jimmy Starr | WLWDWW | Fitzroy Stadium, Melbourne | LOST Technical knockout |
| 1937-06-19 | Keith Lawson | LDLDLL | Wagga Wagga | LOST Points |
| 1937-05-17 | Art (Young) Campbell | LWLLW | Sydney Stadium, Sydney | LOST Technical knockout |
| 1937-04-23 | Bluey Williams | LWLLWL | Fitzroy Stadium, Melbourne | WIN Points |
| 1937-04-09 | Bluey Williams | LLWLLW | Fitzroy Stadium, Melbourne | WIN Points |
| 1937-03-29 | Bluey Williams | LWLLWL | Fitzroy Stadium, Melbourne | WIN Points |
| 1937-02-13 | Tommy Vaughan | WWLWWW | Brisbane Stadium, Brisbane | DRAW Points |
| 1936-03-11 | Johnny Condon | LLLLLD | Plaza Theatre, Geelong | LOST KO |
| 1936-01-03 | Tony Rock | WLLWDW | Fitzroy Stadium, Melbourne | LOST Technical knockout |
| 1935-08-09 | Willard Brown | LDWWWW | Fitzroy Stadium, Melbourne | LOST Points |
| 1935-05-31 | Johnny Condon | WLLWLL | Fitzroy Stadium, Melbourne | WIN KO |
| 1935-01-18 | Jimmie Mitchell | LWWWLW | Fitzroy Stadium, Melbourne | LOST Points |
| 1934-12-06 | Ron Richards | LWWWWL | Brisbane Stadium, Brisbane | LOST Technical knockout |
| 1934-12-01 | Reg Hickey | DWDWWL | Brisbane Stadium, Brisbane | WIN Technical knockout |
| 1934-11-17 | Fred Henneberry | WWWWLW | Brisbane Stadium, Brisbane | LOST Technical knockout |
| 1934-11-03 | Reg Hickey | WDWDWW | Brisbane Stadium, Brisbane | WIN Points |
| 1934-08-31 | Johnny Condon | WLWLWL | Fitzroy Stadium, Melbourne | WIN Points |
| 1934-07-20 | Jimmy Richardson | WWDLWW | Gaiety Stadium, Cairns | WIN |
| 1934-06-27 | Ron Richards | LWWLWL | Olympic Theatre, Mackay | DRAW Points |
| 1934-05-07 | Fred Henneberry | DLWLLW | Brisbane Stadium, Brisbane | LOST |
| 1934-04-28 | Ron Richards | WWWLWW | Brisbane Stadium, Brisbane | WIN Points |
| 1934-03-23 | Ron Richards | LLDWWW | Sports Reserve Stadium, Townsville | WIN Points |
| 1934-03-17 | Bobby Delaney | WWWLWW | Brisbane Stadium, Brisbane | DRAW Points |
| 1933-12-11 | Tiger Lee Paige | WLLDLL | Sydney Stadium, Sydney | WIN Technical knockout |
| 1933-11-10 | Barney Kieswetter | WWWWWD | Brisbane Stadium, Brisbane | LOST Points |
| 1933-11-03 | Barney Kieswetter | DWWWWW | Brisbane Stadium, Brisbane | DRAW Points |
| 1933-09-16 | Jack Delaney | WLLLL | Brisbane Stadium, Brisbane | WIN KO |
| 1933-08-05 | Cyril (Young) Pluto | LWWLWW | Brisbane Stadium, Brisbane | LOST Points |
| 1933-07-15 | Bobby Delaney | WLWLWL | Brisbane Stadium, Brisbane | DRAW Points |
| 1933-06-24 | Bobby Delaney | DLWLWL | Brisbane Stadium, Brisbane | LOST Points |
| 1933-05-20 | Johnny Bourke | WWWLLW | Brisbane Stadium, Brisbane | WIN Points |
| 1933-05-13 | Alby Roberts | LLWLLL | Brisbane Stadium, Brisbane | WIN Points |
| 1933-04-29 | Russ Critcher | WWWWWL | Brisbane Stadium, Brisbane | WIN Technical knockout |
| 1933-04-22 | Max Raynor | LWWLLL | Brisbane Stadium, Brisbane | WIN Technical knockout |
| 1933-04-08 | Jack Roberts | LWLWWL | Brisbane Stadium, Brisbane | WIN Technical knockout |
| 1933-03-13 | Jack Rainsford | DLWLWW | Sydney Stadium, Sydney | DRAW Points |
| 1933-03-11 | Jack Roberts | WLWLWW | Sydney Stadium, Sydney | WIN Technical knockout |
| 1933-02-28 | Barney Kieswetter | WWDLW | Leichhardt Stadium, Sydney | DRAW Points |
| 1932-12-16 | Danny Ryan | DWDLWL | Luxor Theatre, Perth | WIN Points |
| 1932-11-18 | Tommy Fielding | WLDWL | Luxor Theatre, Perth | WIN Points |
| 1932-10-28 | Len White | LLLLLL | Luxor Theatre, Perth | WIN Points |
| 1932-08-26 | Sam Stivey | WWDWLD | Cremorne Theatre, Kalgoorlie | WIN KO |
| 1932-08-19 | Billy Negus | WLWDLD | Unity Stadium, Perth | WIN Points |
| 1932-08-05 | Cyril (Young) Pluto | LWWWWW | Unity Stadium, Perth | WIN Points |
| 1932-07-18 | Bob Fitzsimmons | LLLLWD | Cremorne Stadium, Kalgoorlie | WIN Points |
| 1932-07-08 | Snowy Kelly | WWWLLL | Capitol Stadium, Wiluna | WIN KO |
| 1932-07-01 | Jack Heeney | LWWWLL | Unity Stadium, Perth | WIN Points |
| 1932-06-10 | Kid Lewis | LWLWWW | Unity Stadium, Perth | WIN Points |
| 1932-06-03 | Arthur Deans | WWLWLW | Unity Stadium, Perth | WIN Points |
| 1932-03-18 | Arthur Deans | DWWWLW | Unity Stadium, Perth | WIN Points |
| 1932-02-26 | Cyril (Young) Pluto | WWLLWW | Unity Stadium, Perth | WIN Points |
| 1932-02-19 | Kid Lewis | WWWWLW | Unity Theatre, Perth | WIN Corner retirement |
| 1932-02-05 | Cyril (Young) Pluto | LWWLLW | Unity Stadium, Perth | LOST KO |
| 1931-12-31 | Jimmy Ward | WW | Olympia Stadium, Perth | WIN KO |
| 1931-12-26 | Cyril (Young) Pluto | DWLWWL | Olympia Stadium, Perth | WIN Points |
| 1931-07-11 | Ron Negus | WWWWWL | Brunswick Stadium, Brunswick, Melbourne | WIN Points |
| 1931-06-27 | Ron Negus | LWWWWW | Brunswick Stadium, Melbourne | WIN Points |
| 1931-05-22 | Wally Wallsworth | L | Fitzroy Stadium, Fitzroy, Melbourne | WIN Points |
| 1930-12-17 | Mick Joyce | debut | Fitzroy Stadium, Fitzroy, Melbourne | DRAW Points |
| 1930-09-03 | Billy Woods | debut | West Melbourne Stadium, Melbourne | WIN Points |
| 1930-08-13 | Lorrie Simmonds | W | West Melbourne Stadium, Melbourne | WIN Points |
| 1927-12-03 | Keith Lawson | W | Wonderland Gardens, Wagga Wagga | LOST KO |
| 1921-12-14 | Arthur Smith | WWW | West Melbourne Stadium, Melbourne | LOST Points |
| 1921-12-10 | Mat Rivett | WLW | West Melbourne Stadium, Melbourne | WIN Points |