WBO dünya şampiyonları listesi
Yarı Velter Sıklet

| Boksör: | Tarih: | Yer: | Unvan   Koruma: |
| --- | --- | --- | --- |
|  Héctor Camacho def. Ray Mancini | Mart 6, 1989 | Reno, Nevada, ABD | 2 |
|  Greg Haugen | Şubat 23, 1991 | Las Vegas, Nevada, ABD | 0 |
|  Héctor Camacho (2) | Mayıs 19, 1991 | Reno, Nevada, ABD | 0 |
| Title vacated | 1992 |  |  |
|  Carlos González def. Jimmy Paul | Haziran 29, 1992 | Inglewood, California, ABD | 3 |
|  Zack Padilla | 7 Haziran 1993 | Las Vegas, Nevada, ABD | 4 |
| Title vacated | Temmuz 24, 1994 | Title vacated when Padilla retired after his final defense against Juan Laporte in Los Angeles. | Title vacated when Padilla retired after his final defense against Juan Laporte in Los Angeles. |
|  Sammy Fuentes def. Fidel Avendano | Şubat 20, 1995 | Inglewood, California, ABD | 1 |
|  Giovanni Parisi | Mart 9, 1996 | Milano, İtalya | 5 |
|  Carlos González (2) | Mayıs 29, 1998 | Pesaro, İtalya | 0 |
|  Randall Bailey | Mayıs 15, 1999 | Miami, Florida, ABD | 2 |
|  Ener Julio | Temmuz 22, 2000 | Miami, Florida, ABD | 0 |
| Title vacated | Haziran 2001 | Title vacated when a routine eye exam reveals that Julio has cataracts. | Title vacated when a routine eye exam reveals that Julio has cataracts. |
|  DeMarcus Corley def. Felix Flores | Haziran 30, 2001 | Las Vegas, Nevada, ABD | 2 |
|  Zab Judah | 12 Temmuz 2003 | Las Vegas, Nevada, ABD | 1 |
| Title vacated | 2004 | Judah vacated the title to move up to the Welterweight division. | Judah vacated the title to move up to the Welterweight division. |
|  Miguel Cotto def. Kelson Pinto | Eylül 11, 2004 | San Juan, Porto Riko | 6 |
| Title vacated | 2006 | Cotto vacated the title to move up to Welterweight and challenge for the WBA title His last defense was against Paul Malignaggi on Haziran 10, 2006 in New York, New York. | Cotto vacated the title to move up to Welterweight and challenge for the WBA title His last defense was against Paul Malignaggi on Haziran 10, 2006 in New York, New York. |
|  Ricardo Torres def. Mike Arnaoutis | Kasım 18, 2006 | Las Vegas, Nevada, ABD | 3 |
|  Kendall Holt def. Ricardo Torres | Temmuz 5, 2008 | Las Vegas, Nevada, ABD | 1 |
|  Timothy Bradley  this bout was a title unification match for both WBO and WBC titles | Nisan 4, 2009 | Montreal, Quebec, Kanada | 1 |
| Title vacated | 2012 | Bradley vacated the title to move up to Welterweight and challenge for the WBO title His last defense was against Joel CasaMayısor on Kasım 12, 2011 in Las Vegas. | Bradley vacated the title to move up to Welterweight and challenge for the WBO title His last defense was against Joel CasaMayısor on Kasım 12, 2011 in Las Vegas. |
|  Juan Manuel Marquez  def. Serhiy Fedchenko | Nisan 14, 2012 | Meksika City, Meksika | 0 |
| Title vacated | 2012 | Marquez vacated the title to move up to Welterweight and challenge Manny Pacquiao. | Marquez vacated the title to move up to Welterweight and challenge Manny Pacquiao. |
|  Mike Alvarado def. Brandon Rios | Mart 30, 2013 | Las Vegas, Nevada, ABD | 0 |
|  Ruslan Provodnikov | Kasım 19, 2013 | Denver, Colorado, ABD | 0 |
|  Chris Algieri | Haziran 14, 2014 | Brooklyn, New York, ABD | 0 |
| Title vacated | Ekim 2014 | Algieri vacated the title to challenge Manny Pacquiao at welterweight. | Algieri vacated the title to challenge Manny Pacquiao at welterweight. |
|  Terence Crawford def. Thomas Dulorme current champion | Nisan 18, 2015 | Arlington, Texas | 0 |