Ol Kalou is a town in Kenya. It is the capital of Nyandarua County of the former Central Province. It is located west of Aberdare range and 40 kilometres east of Nakuru. Ol Kalou is connected by road to Gilgil, Nyahururu and Nakuru. Ol Kalou forms a town council with a population of 47,795, of whom 15,186 are classified urban (1999 census ).