Traditional Kalenjin society is the way of life that existed among the Kalenjin-speaking people prior to the advent of the colonial period in Kenya and after the decline of the Chemwal, Lumbwa and other Kalenjin communities in the late 1700s and early 1800s.

The Nandi are part of the Kalenjin, a Nilotic tribe living in East Africa. The Nandi ethnic group live with close association and relation with the Kipsigis tribe. They traditionally have lived and still form the majority in the highland areas of the former Rift Valley Province of Kenya, in what is today Nandi County. They speak the Nandi dialect of the Kalenjin language.