The Paris Marathon is an annual marathon hosted by the city of Paris, France. It is the largest running event in France in terms of finishers and the marathon with the second-most finishers in the world, behind the New York City Marathon.

The marathon is a long-distance foot race with a distance of 42.195 km, usually run as a road race, but the distance can be covered on trail routes. The marathon can be completed by running or with a run/walk strategy. There are also wheelchair divisions. More than 800 marathons are held throughout the world each year, with the vast majority of competitors being recreational athletes, as larger marathons can have tens of thousands of participants.