Ekiden (駅伝) is a long-distance running multi-stage relay race, mostly held on roads.

The original Japanese term had nothing to do with a sport or a competition, but it simply referred to the age old post-horse or stagecoach courier system which transmitted communication by stages, instead of one horse or a man covering the entire long distance. Eki means "station" and den translates as "to communicate, to convey", therefore ekiden could be roughly translated as ''Station to station''. The original meaning of the word is reflected in its rule where each runner at the end of his or her run has to pass down his sash to the next runner.

The first ever ekiden as a sport was held in Japan in 1917 as a 3-day, 23-stage run from Kyoto to Tokyo over 507 kilometres (315 mi), to celebrate the 50th anniversary of Tokyo's establishment as the nation's capital (previously Kyoto was the imperial seat).

Today ekiden is a national sport in Japan, especially popular as inter-varsity competitions between schools or universities, and its popularity has since become widespread and worldwide.

The IAAF staged four editions of a World Road Relay Championship from 1992 (at Hiroshima, Japan) to 1998 as a stage race over the marathon distance with alternate stages of 5 km (3.1 mi) and 10 km (6.2 mi) before a final leg of 7.195 km (4.471 mi). The IAAF now recognizes world records for men for five stages (with a final leg of 12.195 km (7.578 mi)) and for women for six stages over the marathon distance.

The first ekiden race was sponsored by the Yomiuri Shimbun in 1917, and was run over three days between the old Japanese capital of Kyoto and the modern capital of Tokyo, a distance of 508 km, to celebrate the anniversary of the moving of the capital from Kyoto to Edo, which was then renamed Tokyo.^{[citation needed]}

In written Japanese, ekiden combines the character for "station" (駅) and another for "transmit" (伝) and as a word it goes back to ancient times. As a modern game, however, it owes its naming to the poet Zenmaro Toki (1885–1980), who was head of the Yomiuri Shimbun's Social Affairs Department at the time. The original concept of the race hearkens back to Japan's old Tōkaidō communication and transportation system in which stations were posted at intervals along the road. In the race, each runner runs the distance from one "station" to the next, and then hands off a cloth sash, or tasuki, to the next runner.^{[citation needed]}

The lengths of ekiden in Japan can vary greatly, as can the number of runners on a team. For example, in the national junior high ekiden championship, 5 girls cover 12 kilometers and 6 boys cover 18 kilometers. The national high school championship involves 5 girls in a 21 kilometer race and 7 boys in a 42.195 kilometer race, the length of the modern Olympic marathon. In the national inter-prefecture championships, 9 women run 42.195 kilometers and 7 men run 48 kilometers. For the collegiate Hakone Ekiden, a 2-day event, 10 male athletes for each team run 21.9 kilometers. Each runner covers just over a half marathon. The mid-December National Corporate Women's Ekiden Championships, 6 runners cover 42.195 kilometers. In the January 1 National Corporate Men's Ekiden Championships, 7 runners cover 100.0 kilometers. For the mid-January national open championships (teams composed of selected junior high, high school and open athletes), the distances are 42.195 for the women and 48.0 for the men. Notably in distance, in the Round-Kyūshū Ekiden, a 10 days event, 72 segments cover 1064 kilometers around Kyushu Island and it is the longest relay race in the world.