Juma Ndiwa (born 28 November 1960) is a Kenyan former middle-distance runner specialising in the 800 metres. He represented his country at the 1984 and 1988 Summer Olympics as well as the 1983 World Championships. Additionally, he won the gold at the 1982 African Championships and bronze at the 1985 edition. His personal best in the event is 1:44.20 set in Munich in 1983.