Johnny O'Brien boxer
- bouts
- 25
- won
- 13
- lost
- 11
- draw
- 1
- Status
- inactive
- Division
- middleweight
- Debut
- 1941-10-27
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
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| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1947-04-03 | Nick Melnick | WLLLDL | Shrine Temple, Rockford | WIN Points |
| 1946-08-19 | Harold Thomas | LLWL | Marigold Gardens, Chicago | WIN KO |
| 1946-04-30 | Pete Mead | WWLWWW | Muskegon | LOST Technical knockout |
| 1946-03-25 | Jimmy Crow | LWDLLL | Marigold Gardens, Chicago | WIN Technical knockout |
| 1946-02-25 | Joey Hartfield | WWDWDL | City Auditorium, Omaha | WIN Points |
| 1943-05-21 | Gene Simmons | WWWWLL | Armory, Indianapolis | LOST Points |
| 1943-05-10 | Sherman Edwards | LLLLWL | Marigold Gardens, Chicago | WIN Points |
| 1943-05-03 | Louis Jackson | WWL | Marigold Gardens, Chicago | WIN Points |
| 1943-04-12 | Bishop Murphy | LLLL | Marigold Gardens, Chicago | WIN KO |
| 1943-01-11 | Al Sheridan | LLLLLL | Marigold Gardens, Chicago | WIN Technical knockout |
| 1943-01-01 | Tito Taylor | WWLLWL | Auditorium, Milwaukee | LOST Points |
| 1942-12-14 | Jimmy Reeves | LLWLLW | Marigold Gardens, Chicago | LOST Technical knockout |
| 1942-12-07 | Mike Sopko | LLLLLW | Marigold Gardens, Chicago | DRAW Points |
| 1942-11-30 | Mike Sopko | LLLLLL | Marigold Gardens, Chicago | LOST Points |
| 1942-11-16 | Isadore Miner | LLLLLL | Marigold Gardens, Chicago | WIN KO |
| 1942-11-09 | Jimmy Smyles | WLWW | Marigold Gardens, Chicago | WIN KO |
| 1942-11-02 | Jimmy Smyles | WLW | Marigold Gardens, Chicago | LOST Points |
| 1942-07-20 | Ted Morrison | WLLLWW | Marigold Gardens Outdoor Arena, Chicago | WIN KO |
| 1942-07-06 | Jimmy Pierce | LDWLLW | Northside Arena, Chicago | LOST Points |
| 1942-03-09 | George Feltes | WWLWWW | Marigold Gardens, Chicago | LOST Points |
| 1942-03-02 | Isadore Miner | L | Marigold Gardens, Chicago | WIN KO |
| 1942-02-16 | Alex Kondos | DLLL | Marigold Gardens, Chicago | WIN KO |
| 1941-12-29 | George Feltes | WLLWLL | Marigold Gardens, Chicago | LOST Points |
| 1941-12-15 | Stanley Murczek | DLWLWW | Marigold Gardens, Chicago | LOST Points |
| 1941-10-27 | George Feltes | LDWWLL | Marigold Gardens, Chicago | LOST Points |