The Borough of Koroit was a local government area about northwest of Warrnambool in western Victoria, Australia. The borough covered an area of immediately to the north of the Tower Hill State Game Reserve, and existed from 1870 until 1985.
It was first incorporated on 7 October 1870. On 1 June 1985, the borough was united with the Shire of Warrnambool as the Koroit Riding.
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