Mahembe is an administrative ward in Kigoma District of Kigoma Region in Tanzania. The ward covers an area of , and has an average elevation of . In 2016 the Tanzania National Bureau of Statistics report there were 14,435 people in the ward, from 22,763 in 2012. Prior to 2014 Nkungwe was a village in the Mahembe Ward before splitting off into is own ward.
The ward has 2 villages and 11 hamlets.