Robert Kwemoi Chemosin (born 1 February 1989) is a Kenyan long-distance runner who competes in half marathons. His personal best for the event is 59:19 minutes. He is managed by Gianni De Madonna.Athletes by event. Demadonna. Retrieved 11 February 2015.

He first began competing outside of Kenya in 2012. He was the winner of the Udine Half Marathon in a personal best of 60:23 minutes that year, runner-up at the 15 km du Puy-en-Velay and fifth at the Giro al Sas.

He competed extensively over the half marathon the following year. He was runner-up to Wilson Kiprop at the Roma-Ostia Half Marathon in March, running a time of 59:19 minutes which would rank him sixth globally that year. Later that same month he was runner-up at the Stramilano, but his following outings were less successful, finishing outside the top eight in Yangzhou, Lille and Delhi. He acted as a pacemaker for the 2013 Frankfurt Marathon.

Chemosin's strong personal best from 2013 earned him a place for the 2014 IAAF World Half Marathon Championships, but he was the worst performer among the Kenyan team, finishing in 24th place more than two and a half minutes behind fellow Kenyan and race winner Geoffrey Kipsang Kamworor. His best result of the year came again at the Roma-Ostia race where he was fifth in a time of 60:24 minutes. He was again down the rankings at the Luanda Half Marathon, taking twelfth.

In 2015 Chemosin won second place in Warsaw with 2:08:05 to his record and $15,000 in cash. In October of the same year he competed at the Toronto Marathon where he got in fourth with a 2:09:38 run and then became a winner of Rome-Ostia Half Marathon with 59:37 to his credit.

Personal bests 10 kilometres – 28:06 (2014) 15 kilometres – 42:11 (2013) 20 kilometres – 58:27 (2014) Half marathon – 59:19 (2013)

International competitions 2014World Half Marathon ChampionshipsCopenhagen, Denmark24thHalf marathon1stTeam

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