The Municipal Commissioner is a key figure in the overall local self-government setup that has developed in Mumbai over a century. The Municipal Commissioner is one of the authorities under the Mumbai Municipal Corporation Act, 1888. The Municipal Commissioner is head of Executive Wing under section 54 of Mumbai Municipal Corporation Act, 1888. The Municipal Commissioner is appointed by Government of Maharashtra under section 54 of Mumbai Municipal Corporation Act, 1888. The Municipal Commissioner is responsible for developing & maintaining civic infrastructure of the city like water supply, roads, storm water, drainage and efficient delivery of various services to the citizens of Mumbai.
       The Municipal Commissioner deputes various departments to the Additional Municipal Commissioners, Deputy Municipal Commissioners, Assistant Commissioners and various heads of Department in discharge of his functions.

Additional Municipal Commissioner is appointed by Government of Maharashtra under Mumbai Municipal Corporation Act, 1888 section 54. Additional Municipal Commissioner functions as commissioner for departments which are deputed to him by Municipal Commissioner. At present there are four Additional Municipal Commissioners

Deputy Municipal Commissioner is appointed under various sections of Mumbai Municipal Corporation Act, 1888 to assist Municipal Commissioner/ Additional Municipal Commissioners in discharge of their responsibilities. Deputy Municipal Commissioner is appointed by Corporation with the approval of Government of Maharashtra.

Assistant Commissioner is administrative head of wards and play a key role in day to day service delivery to citizens. City has been divided in 24 Administrative Wards and each of them is headed by Assistant Commissioner. (Formerly known as Ward Officer). Assistant Commissioner is appointed by Corporation on recommendation of Maharashtra Public Services.