International Boxing Union (since 1996)

The International Boxing Union (IBU) is a professional boxing sanctioning body founded in Atlanta, Georgia, United States, in 1996. It is unrelated to the International Boxing Union, based in Europe, which operated until the Second World War.

Although the IBU has sanctioned title matches and "world champions" from countries such as Barbados, Guyana, Germany, and Hungary, they often lack widespread recognition as the best fighters in their class. IBU titles can be a first title for boxers who progress to gain additional titles of the more recognized "Big Four".