The Los Angeles Marathon is an annual running event typically held each spring in Los Angeles, California, since 1989. The marathon was inspired by the success of the 1984 Summer Olympic Games hosted in Los Angeles, and has become one of the largest marathons in the country, with more than 25,000 participants, thousands of volunteers, and hundreds of thousands of spectators.

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.