Mercy Cherono Koech (born 7 May 1991 in Kericho) is a Kenyan long-distance runner. She was the silver medalist in the 5000 metres at the 2013 World Championships in Athletics.She is a two-time world junior champion in the 3000 metres (2008, 2010) and has also won gold medals at the 2007 World Youth Championships in Athletics and 2008 Commonwealth Youth Games.