The Colombo Municipal Council is the municipal governing body of Colombo, the largest city and financial centre in Sri Lanka. It consists of a directly elected executive Mayor of Colombo, and elected 119 municipal councilors. The council was formed in 1865, it first met in 1866 and derives most of its powers from Municipal Council Ordinance No. 29 of 1947.

Colombo is the executive and judicial capital and largest city of Sri Lanka by population. According to the Brookings Institution, the Colombo metropolitan area has a population of 5.6 million, and 752,993 in the Municipality. It is the financial centre of the island and a tourist destination. It is located on the west coast of the island and adjacent to the Greater Colombo area which includes Sri Jayawardenepura Kotte, the legislative capital of Sri Lanka, and Dehiwala-Mount Lavinia. Colombo is often referred to as the capital since Sri Jayawardenepura Kotte is itself within the urban/suburban area of Colombo. It is also the administrative capital of the Western Province and the district capital of Colombo District. Colombo is a busy and vibrant city with a mixture of modern life, colonial buildings and monuments.