Ukraine
- The Klitschkos (brothers)
- Vitali, former WBO and two time current WBC Heavyweight Champion
- Wladimir, former two time champion and current unified WBA, WBO, IBF, IBO and The Ring Heavyweight Champion
Together, the Klitschko brothers hold all of the belts in the Heavyweight Division, as of 2nd July 2011 (when Wladimir Klitschko defeated David Haye for the WBA title)
Read more about this topic: List Of Boxing Families