This is a list of WBO world champions, showing every world champion certified by the World Boxing Organization (WBO).
The WBO is one of the four major governing bodies in professional boxing, and has awarded world championships in 17 different weight classes since 1989.
Boxers who won the title but were stripped due to the title bout being overturned to a no contest are not listed.
r – Champion relinquished title.
s – Champion stripped of title.