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. 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 and fifth at the Giro al Sas.