Sara Gambai is an ethnic group in Chad. They speak Ngambay, a Nilo-Saharan language. It is a trade language. It is the largest of the Sara languages, also classified as one single language. Most are non-Muslim. The population of this ethnicity in Chad possibly exceeds 1,000,000. The Sara people, of whom the Sara Gambai are a part, are the largest ethnic group in Chad. Other subgroups of the Sara include the Sar, Mbay, Kaba, Gulay, and Dai. The Sara Gambai live in the southern parts of Chad.