The men's marathon race of the 1908 Summer Olympics took place in London on 24 July 1908. Johnny Hayes won after Dorando Pietri was disqualified for having received assistance before the finish line. For the first time in an Olympic marathon, the distance was 26 mi 385 yd (42.195 km), which would become the standard distance in 1921. 75 competitors entered the race, of whom 55 from 16 nations started, with 27 from 11 nations finishing. NOCs could enter up to 12 athletes.