Cranbourne is a suburb in Melbourne, Victoria, Australia, 43 km south-east of Melbourne's Central Business District, located within the City of Casey local government area. Cranbourne recorded a population of 21,281 at the 2021 census.

Melbourne is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in Australia. Its name generally refers to a 9,993 km2 (3,858 sq mi) metropolitan area also known as Greater Melbourne, comprising an urban agglomeration of 31 local municipalities, although the name is also used specifically for the local municipality of City of Melbourne based around its central business area.