Joseph Mwengi Mutua (born 10 December 1978 in Machakos, Eastern Province) is a Kenyan runner who specializes in the 800 metres.
He holds the African indoor record in 800 m with 1:44.71 minutes, achieved in January 2004 in Stuttgart.
In 2000, he failed to advance 800 metres heats, but was part of the Kenyan 4*400m relay team that reached semifinals.
He was part of the 4 × 800 m relay team who currently holds the world record.
This Kenyan biographical article relating to athletics is a stub.