List of largest running events
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This list of the largest running events in the world is based on the number of participants. If available, the number of "registered" participants or finishers may be specified. Not all participants will actually complete a race. Running USA's Road Running Information Center estimates that, on average, 80%-85% of registrants will complete a race. If a yearly event has consistently high participation, the year in which that event had the largest number of participants has been listed.
With 110,000 participants, the Bay to Breakers race held on May 18, 1986, in San Francisco, California was recognized by the Guinness Book of World Records as the world's largest footrace. On October 10, 2010, 116,086 out of 160,000 registered runners in Manila were reported to have finished a run entitled "10.10.10 A Run for the Pasig River". An official for the ABS-CBN Foundation said that documentation of the event was being forwarded to Guinness World Records. The Guinness World Records certified Run for the Pasig River as having the most participants in a racing event on December 26, 2010.
On 6 August 2023, Kalaignar Centenary Marathon which was held at Chennai, India is officially recognized and approved by Guinness World Records having 65,762 people taking part and considered as the Largest Running Race Series held in the world.
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