World records were not officially recognized by the आइएएएफ until January 1, 2004; previously, the best times for the marathon were referred to as the 'world best'. Courses must conform to आइएएएफ standards for a record to be recognized. However, marathon routes still vary greatly in elevation, course, and surface, making exact comparisons impossible. Typically, the fastest times are set over relatively flat courses near sea level, during good weather conditions and with the assistance of pacesetters.

The world record time for men over the distance is 2 hours 3 minutes and 59 seconds, set in the Berlin Marathon by Haile Gebrselassie of Ethiopia on September 28, 2008, an improvement of 51 minutes and 19 seconds since Johnny Hayes' gold medal performance at the 1908 Summer Olympics. Gebrselassie's world record represents an average pace of under 2:57 per kilometre (4:44 per mile), average speed of over 20.4 km/h (12.6 mph). The world record for women was set by Paula Radcliffe of Great Britain in the London Marathon on April 13, 2003, in 2 hours 15 minutes and 25 seconds. This time was set using male pacesetters; the fastest time by a woman without using a male pacesetter ("woman-only") was also set by Paula Radcliffe, again during the London Marathon, with a time of 2 hours 17 minutes and 42 seconds, on April 17, 2005.

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