Simon Biwott (born March 3, 1970 in Eldoret, Uasin Gishu District) is a former long-distance runner from Kenya, who won the silver medal in the men's marathon at the 2001 World Championships in Athletics. The race in Edmonton, Canada was won by Ethiopia's reigning Olympic champion Gezahegne Abera. A year later Biwott won the Rotterdam Marathon.
Biwott started racing relatively late, at the age of 27, and retired from international competition early 2005, having won six out of fifteen marathons in which he started. Besides Rotterdam he triumphed in Cancún, Mexico City (1998), Berlin, Milan (2000), and Paris (2001). His personal best came in "Berlin 2002": 2:06:49. After his career in athletics he started a private school in Eldoret.