The Shire of Nillumbik is a local government area in Victoria, Australia. It contains outer northern suburbs of Melbourne and rural localities beyond the urban area. It has an area of 432 square kilometres and at the 2021 census, the Shire had a population of 62,895. It was formed in 1994 from the merger of parts of the Shires of Eltham, Diamond Valley, Healesville and the City of Whittlesea. The Shire uses the tag-line The Green Wedge Shire. The Nillumbik Council offices are located in Civic Drive, Greensborough.

The Shire of Eltham was a local government area about 25 kilometres (16 mi) northeast of Melbourne, the state capital of Victoria, Australia. The shire covered an area of 277.13 square kilometres (107.0 sq mi), and existed from 1856 until 1994.