Mayweather stripped of WBO belt he won by beating Pacquiao.
The five-weight king claimed the title in May but has failed to pay a sanctioning fee or decided at which weight class to continue as champion.
"The WBO World Championship Committee is allowed no other alternative but to cease to recognize Mr Floyd Mayweather Jr as the WBO welterweight champion of the world and vacate his title for failing to comply with our WBO regulations of world championship contests," said a statement by the World Boxing Organisation.
Floyd Mayweather, who punches women, lost the title he won defeating Manny Pacquiao because he didn't pay a bill. http://t.co/548Yj8r1py— Jamil Smith (@JamilSmith) July 7, 2015
#ICYMI: Boxing: Mayweather stripped of WBO welterweight belt http://t.co/7YY6Ab1Sqe pic.twitter.com/qDMlU35HVs— Astro AWANI (@501Awani) July 7, 2015
Floyd Mayweather has been stripped of the WBO welterweight belt won from Manny Pacquiao in May http://t.co/pjVMYBwCBN pic.twitter.com/mCAefQqj9R— BBC Sport (@BBCSport) July 7, 2015