WBU is the World Boxing Union, a boxing sanctioning body.
WBU may also refer to:
Organisations World Blind Union, an organization representing the blind or partially sighted Welsh Badminton Union, the national governing body for badminton in Wales, now renamed Badminton Wales Welsh Baseball Union, the national governing body of British baseball in Wales World Broadcasting Unions
Other uses Boulder Municipal Airport (IATA code), US Wayland Baptist University, US