Mjini Magharibi Region, Zanzibar Urban West Region or West Zanzibar Region is one of the 31 regions of Tanzania. The region covers an area of 230 km2 (89 sq mi). The region is located entirely on the island of Zanzibar and bordered to the west by the Indian Ocean, north by Unguja North Region and the east by Unguja South Region. The region is home to one of the seven World Heritage Sites located in Tanzania, namely; Stonetown of Zanzibar. The regional capital is Zanzibar City. The region is the most developed region with the highest human development index in Tanzania at 0.718. According to the 2012 census, the region has a total population of 593,678.

Zanzibar is an insular semi-autonomous region which united with Tanganyika in 1964 to form the United Republic of Tanzania. It is an archipelago in the Indian Ocean, 25–50 km (16–31 mi) off the coast of the African mainland, and consists of many small islands and two large ones: Unguja and Pemba Island. The capital is Zanzibar City, located on the island of Unguja. Its historic centre, Stone Town, is a World Heritage Site.