The Matumbi are a Bantu ethnolinguistic group native to Kilwa District, Lindi Region in southern Tanzania, who speak the Matumbi language.

[1] They are the largest ethnic group in Kilwa District.

The Matumbi are mainly farmers and the ones that settled on the coast and Songosongo Islands are fishermen.

Crops grown by Matumbi include rice and coconuts.

[2] Like many groups in the world, the Matumbi are a patrilineal society.