The International Association of Ultrarunners (IAU) is the world governing body of ultra running, race events longer than the marathon distance of 42.2 km. It regulates and sanctions the World Championships for various ultramarathon distances, and tracks world records in ultra distance races approved by IAU. IAU operates under the patronage of the World Athletics and follows World Athletics rules.

IAU events include:

• 24-hour run
• Ultramarathon
• International Trail Running Association (ITRA)

• Official website
• ULTRAmarathonRunning.com Global Ultramarathon Races & Events Calendar

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