The Shire of Mornington was a local government area about 50 kilometres (30 mi) south of Melbourne, the state capital of Victoria, Australia, encompassing the western extremity of the Mornington Peninsula.

The shire covered an area of 90.65 square kilometres (35.0 sq mi) immediately to the south of Frankston, and existed from 1860 until 1994.

On 31 May 1893, it was renamed the Shire of Frankston and Hastings, while its western riding was severed and named New Mornington, to avoid confusion with the previous entity.

The facility is used today as a civic centre and library by the Shire of Mornington Peninsula.

The Shire of Mornington was divided into four ridings, each of which elected three councillors: * Council seat.