Mark Kosgey Kiptoo (born 21 June 1976) is a Kenyan long-distance runner who set the world record in the marathon for the Masters age group (40 and over) by running 2:07:50 in the 2018 Frankfurt Marathon. He also specialized in the 5000 metres throughout his career. He is a two-time gold medalist in the event at the Military World Games and won bronze medals over the distance at the 2010 Commonwealth Games and the 2010 African Championships in Athletics. He has also represented Kenya at the IAAF World Cross Country Championships and the All-Africa Games.