Wilson Kosgei Kipketer is a Danish former middle distance runner. He is the second fastest of all time over 800 meters, setting the world record and breaking his own record two more times all in 1997. He dominated the 800 m distance for a decade, remaining undefeated for a three-year period and running 8 of the 17 currently all-time fastest times. He won gold medals in three successive editions of the IAAF World Championships in Athletics. Though unable to compete in the 1996 Olympics near the peak of his career, he earned silver in 2000 and bronze in 2004. Kipketer's 800 meters world record stood for almost 13 years. It was surpassed on 22 August 2010, when David Rudisha beat it by 0.02 seconds, running 1:41.09. Rudisha would eventually go on to further lower the 800m world record to the first and only sub one minute 41 second run. Kipketer still currently holds the indoor world record for the 800 metres.

The 800 metres, or meters, is a common track running event. It is the shortest commonly run middle-distance running event. The 800 metres is run over two laps of an outdoor (400-metre) track and has been an Olympic event since the first modern games in 1896. During the winter track season the event is usually run by completing four laps of an indoor 200-metre track.