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

The shire covered an area of 1,458.2 square kilometres (563.0 sq mi), and existed from 1859 until 1994.

Colac was first incorporated as a road district on 11 May 1859, and became a shire on 10 May 1864.

[2] On 23 September 1994, the Shire of Colac was abolished, and along with the City of Colac, the Shire of Otway and parts of the Shires of Heytesbury and Winchelsea, was merged into the newly created Shire of Colac Otway.

[3] * Estimate in the 1958 Victorian Year Book.