The men's marathon event was part of the track and field athletics programme at the 1924 Summer Olympics, in Paris, France. The marathon was held on Sunday, July 13, 1924. It was only the second Olympic marathon to use the distance of 42.195 km which was first used in 1908 and is now the standard marathon distance. Fifty-eight runners from 20 nations competed, with no more than 6 runners per nation. The event was won by Albin Stenroos of Finland, the nation's second consecutive Olympic marathon victory.

Clarence Harrison DeMar was a U.S. marathoner, winner of seven Boston Marathons, and Bronze medalist at the 1924 Paris Olympics. He was known by the nickname "Mr. DeMarathon."