The Mount Fuji Marathon (富士山マラソン, Fujisan Marason) is an annual marathon sporting event in Yamanashi Prefecture, Japan.

The first running of the event took place on November 25, 2012.

In 2012, both the name of the race and the course were changed, with the route being changed to a single lap around Lake Kawaguchi and the nearby Lake Saiko.

[1] Over 23,000 participants were registered for the inaugural race vs 13,000 participants the year before and organizers failed to take into account the logistics from the additional runners.

Traffic backed up and over 5000 of the registrants were not able to run.