Mbulaeni Tongai Mulaudzi OIB was a South African middle distance runner, and the 2009 world champion in the men's 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.