The Honolulu Marathon is a marathon in Honolulu, Hawaii, first held on December 16, 1973. It is one of the world's largest marathons, taking place annually on the second Sunday in December. The marathon is popular for its location in Hawaii, and is also popular among first-time marathoners, many of whom are visitors from Japan.

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.