The City of Johannesburg Metropolitan Municipality is a metropolitan municipality that manages the local governance of Johannesburg, the largest city in South Africa. It is divided into several branches and departments in order to expedite services for the city. Zulu is the most spoken home language at 23.4% followed by English at 20.1%.

Johannesburg is the most populous city in South Africa with 4,803,262 people, and is classified as a megacity; it is one of the 100 largest urban areas in the world. It is the provincial capital and largest city of Gauteng, which is the wealthiest province in South Africa. Johannesburg is the seat of the Constitutional Court, the highest court in South Africa. Most of the major South African companies and banks have their head offices in Johannesburg. The city is located within the mineral-rich Witwatersrand hills, the epicentre of the international-scale mineral, gold and (specifically) diamond trade.