Simon Maina Munyi (born 18 March 1978) is a Kenyan former long-distance runner who competed in track and road running events. In his first year of international competition, he was the gold medallist in the 10,000 metres at the 1998 Commonwealth Games.Maina was also runner-up at the 1998 Goodwill Games and represented Kenya at the 1999 All-Africa Games and Chiba Ekiden. He has personal bests of 27:18.74 minutes over 10,000 m and 60:48 minutes for the half marathon.