Kilwa Kisiwani is an island, national historic site, and hamlet community located in the township of Kilwa Masoko, the district seat of Kilwa District in the Tanzanian region of Lindi in southern Tanzania. Kilwa Kisiwani is the largest of the nine hamlets in the town of Kilwa Masoko and is also the least populated hamlet in the township with fewer than 1,000 residents.

Kilwa Masoko or Masoko is an administrative ward in Kilwa District of Lindi Region in Tanzania. The ward covers an area of 200 km2 (77 sq mi), and has an average elevation of 11 m (36 ft). The ward is also the capital of Kilwa District. According to the 2012 census, the ward has a total population of 13,601.