The Nyamwezi, or Wanyamwezi, are one of the Bantu groups of East Africa. They are the second-largest ethnic group in Tanzania. The Nyamwezi people's ancestral homeland is in parts of Tabora Region, Singida Region, Shinyanga Region and Katavi Region. The term Nyamwezi is of Swahili origin, and translates as "people of the moon" or "people of the west", the latter being more meaningful to the context.

The Gogo also known as Gongwe(Wagogo, in Swahili) are a Bantu ethnic and linguistic group based in the Dodoma Region of central Tanzania. In 1992 the Gogo population was estimated to number 1,300,000..