John Nzau Mwangangi (born 1 November 1990) is a Kenyan long-distance runner who competes over distances ranging from 5000 metres to the half marathon.

After finishing as runner-up at the Kenya Prison Service cross country and 5000 metres championships,[4][5] he won the 20 km de Lausanne and 10-mile Grand Prix von Bern.

[7] In March ran 59:56 minutes to dip under the hour mark for the first time at the City-Pier-City Half Marathon, taking third in a close race.

[13] He won for a second consecutive time at the Paris 20K then completed the same feat at the Valencia Half Marathon, where he improved his best over the distance to 59:45 minutes.

[17] At the 2012 World Half Marathon Championships in Kavarna, Bulgaria, he won the bronze medal in a time of 1:01:01 hours, and helped his teammates to win the team title.