International Association of Ultrarunners (IAU)

The International Association of Ultrarunners (IAU) is the global governing body that oversees ultramarathon running—races longer than the standard marathon of 42.195 kilometers (26.2 miles). It sets international rules, standards, and guidelines to promote fairness, safety, and the growth of ultrarunning events worldwide. The IAU also organizes world championships and supports local ultrarunning communities, ensuring consistency and recognition across different countries. Its role is to unify athletes, race organizers, and national federations in advancing the sport of ultra-distance running.