The City of Warrnambool is a local government area in the Barwon South West region of Victoria, Australia, located in the south-western part of the state.

It covers an area of 121 square kilometres (47 sq mi) and in June 2018 had a population of 34,862.

On 25 October 1955 and 1 October 1978, it annexed part of the south riding of the Shire of Warrnambool, expanding its area progressively to 34.43 square kilometres (13.29 sq mi) by the time of Victoria's local government amalgamations.

The southwest region containing 23 councils was the first to be reviewed, and the City of Warrnambool sought to be part of the process early on.

However post-2004, following an electoral representation review, the decision was made to keep the seven councillors, but abolish the wards, as the review concluded that the geography and natural features of Warrnambool didn't support the retention of equal wards, and that the City of Warrnambool as a whole was a single community of interest.