Joseph Nganga Maregu (born 22 November 1977) is a Kenyan long-distance runner who competes in road running events from 10K to the marathon.

A journeyman competitor on the roads, he made only one international appearance at the 2008 IAAF World Half Marathon Championships, taking ninth place and a team gold medal with Kenya.

[1][2] Active between 2004 and 2014, he initially focused on 10K and half marathon races and won a number of low level French competitions.

He ran his first marathon in Kenya in 2006, but his debut time of 2:24:18 hours was slow.

This was to be his best however and in five subsequent outings he did not better two hours and ten minutes.