The City of Colac was a local government area about 150 kilometres (93 mi) west-southwest of Melbourne, the state capital of Victoria, Australia.

The city covered an area of 10.88 square kilometres (4.2 sq mi), and existed from 1938 until 1994.

Its area was surrounded by the separate and largely rural Shire of Colac.

On 19 January 1938, the Colac Riding severed and became a self-governing borough, which then became a town on 26 May 1948.

[3] The City of Colac was not subdivided into wards, and its seven councillors represented the entire area.