Billy O'Brien boxer
- bouts
- 29
- won
- 19
- lost
- 10
- draw
- 0
- Status
- inactive
- Division
- lightweight
- Debut
- 1930-10-17
- Height
- -
- Reach
- -
- Age
- -
- Born
- -
- Death
- -
- Nationality
- USA
| Date | Opponent | Last Opponents' Results | Place | Result |
|---|---|---|---|---|
| 1935-03-11 | Tommy Howells | WWWWLW | Valley Arena, Holyoke | LOST Unanimous decision |
| 1935-02-25 | Tommy Grady | WWLLDL | Valley Arena, Holyoke | WIN Technical knockout |
| 1935-02-11 | Joe Geno | WWWW | Valley Arena, Holyoke | WIN Split-decision |
| 1934-02-12 | Jimmy Richie | LWWWLW | Valley Arena, Holyoke | LOST Points |
| 1933-12-11 | Joey Izzo | WWDWWW | Valley Arena, Holyoke | LOST Points |
| 1933-10-23 | Art Chapdelaine | LWWWWW | Valley Arena, Holyoke | LOST Points |
| 1933-09-11 | Baby Mack | W | Heywood Arena, West Springfield | WIN Corner retirement |
| 1933-08-07 | Solly Ambrosio | WLLLLL | Heywood Arena, West Springfield | LOST Majority decision |
| 1933-06-05 | Paul Stefanick | LWWWWW | Heywood Arena, West Springfield | WIN KO |
| 1933-02-20 | Solly Ambrosio | LWWWWL | Valley Arena, Holyoke | WIN Technical knockout |
| 1933-01-09 | Angelo Manna | WD | Valley Arena, Holyoke | WIN Points |
| 1932-10-24 | Phil Baker | LWWLWL | Valley Arena, Holyoke | LOST Technical knockout |
| 1932-09-12 | Joe Canty | WW | Heywood Arena, West Springfield | WIN Unanimous decision |
| 1932-07-25 | Rene Fontaine | LWWWWL | Heywood Arena, West Springfield | LOST Split-decision |
| 1932-07-11 | Rene Peloquin | WWWWLL | Heywood Arena, West Springfield | WIN Points |
| 1932-06-06 | Rene Peloquin | LWLWWW | Heywood Arena, West Springfield | LOST Points |
| 1932-04-11 | Charley Pepe | LLWLLW | Valley Arena, Holyoke | WIN Split-decision |
| 1932-03-28 | Charley Pepe | LWLLWL | Valley Arena, Holyoke | WIN KO |
| 1932-03-14 | Armand St. Jean | WLLLLL | Valley Arena, Holyoke | WIN Points |
| 1932-01-18 | Charley Pepe | WLWLLW | Valley Arena, Holyoke | WIN Split-decision |
| 1931-10-12 | Charley Pepe | LWLWLL | Valley Arena, Holyoke | LOST Points |
| 1931-07-27 | Jimmy Stathis | LLLLWW | Heywood Arena, West Springfield | WIN KO |
| 1931-06-15 | Armand St. Jean | LLWLL | Heywood Arena, West Springfield | WIN Points |
| 1931-05-18 | Armand St. Jean | LLWL | Valley Arena, Holyoke | WIN Points |
| 1931-05-04 | Ted Bogash | WLWWL | Valley Arena, Holyoke | WIN Points |
| 1931-04-06 | Ted Lecuyer | LWWL | Valley Arena, Holyoke | WIN KO |
| 1930-11-14 | Ted Lecuyer | LWW | Valley Arena, Holyoke | WIN Points |
| 1930-11-03 | Ted Bogash | W | Valley Arena, Holyoke | WIN Points |
| 1930-10-17 | Ted Bogash | debut | Valley Arena, Holyoke | LOST Points |