Joseph Mwengi Mutua (born 10 December 1978 in Machakos, Eastern Province) is a Kenyan runner who specializes in the 800 metres.

His personal best time is 1:43.33 minutes, achieved in August 2002 in Zürich. He holds the African indoor record in 800 m with 1:44.71 minutes, achieved in January 2004 in Stuttgart.^[1]

He twice competed at the Summer Olympics. In 2000, he failed to advance 800 metres heats, but was part of the Kenyan 4*400m relay team that reached semifinals. At the 2004 Summer Olympics, he reached 800 metres semifinals.^[2]

He won the Kenyan national championships in 2002, 2003 and 2004.

He was part of the 4 × 800 m relay team who currently holds the world record.

Achievements

Year	Competition	Venue	Position	Event	Notes
Representing  Kenya
1996	World Junior Championships	Sydney, Australia	1st	800m	1:48.21
			8th	4 × 400 m relay	3:09.04
2001	Grand Prix Final	Melbourne, Australia	5th	800 m	1:47.09
2002	Commonwealth Games	Manchester, England	2nd	800 m	1:46.57
2003	Military World Games	Catania, Italy	1st	800 m	1:48.84
	World Athletics Final	Monte Carlo, Monaco	2nd	800 m	1:46.13
2004	World Indoor Championships	Budapest, Hungary	6th	800 m	1:47.86
	World Athletics Final	Monte Carlo, Monaco	2nd	800 m	1:46.13