The International Exhibitions Bureau (or Bureau International des Expositions) is the governing body of World's Fairs (Expos or World Fairs). The BIE was established by an international Convention signed in Paris on 22 November 1928, with the following goals:

1. to oversee the calendar, the bidding, the selection and the organisation of Expos;

2. to establish a framework allowing Countries to cooperate under the best conditions as organisers of Expos or as participants through national pavilions.

To date, 141 member countries have adhered to the BIE Convention.

The BIE regulates two types of Expos: International Registered Exhibitions (commonly called Universal Expos), and International Recognized Exhibitions (commonly called Thematic or International Expos).