The Melbourne central business district is the city centre and main urban area of the city of Melbourne, Victoria, Australia, centred on the Hoddle Grid, the oldest part of the city laid out in 1837, and includes its fringes. The Melbourne CBD is located mostly in the local government area of the City of Melbourne, which also includes some of inner suburbs adjoining the CBD, while a small section extends into the City of Port Phillip.

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.