The IAU 100 km World Championships have been held annually since 1987, at different locations, and is organized by the International Association of Ultrarunners (IAU). Due to lack of sponsorship, the 2013 event, planned for Jeju Island, South Korea, was cancelled and the 2014 event, originally due to be held at Daugavpils, Latvia, was held instead in Doha, Qatar.
The championships from 2007 to 2012 incorporated the IAU 100 km European Championships.