The 5K run is a long-distance road running competition over a distance of five kilometres (3.107 mi). Also referred to as the 5K road race, 5 km, or simply 5K, it is the shortest of the most common road running distances. It is usually distinguished from the 5000 metres track running event by stating the distance in kilometres, rather than metres.

Road running is the sport of running on a measured course over an established road. This differs from track and field on a regular track and cross country running over natural terrain.