The Shire of Colac Otway 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 3,438 square kilometres (1,327 mi) and in June 2018 had a population of 21,503. It includes the towns of Apollo Bay, Beeac, Birregurra, Colac, Cressy, Forrest, Kennett River, Lavers Hill, Warrion and Wye River.
The Shire is governed and administered by the Colac Otway Shire Council; its seat of local government and administrative centre is located at the council headquarters in Colac, it also has a service centre located in Apollo Bay.