Melbourne City Centre (officially known simply as Melbourne or colloquially as The City or CBD) is a locality (suburb) within the Greater Melbourne metropolitan area (the capital city of the state of Victoria, Australia). Melbourne City Centre's Hoddle Grid is the anchor of the city's Central Business District and it forms a major component of the city's Central Activities District (officially known as the Capital City Zone)

It is the administrative centre of the City of Melbourne Local Government Area and a major administrative centre (along with East Melbourne) for the State government of Victoria. Its area consists of the original settlement is known as the Hoddle Grid - a one mile long (1.6 km) by half mile wide (0.80 km) grid of streets and lane ways, located on the northern bank of the Yarra River (approx 10 km upstream from the river estuary) and several adjoining areas stretching south along St Kilda Road. Major cultural icons include Federation Square, the State Library of Victoria, Melbourne Immigration Museum, and St Pauls Cathedral and Chinatown and the Queen Victoria Market.

The Central Activities District has extended beyond the original Hoddle Grid and the borders of the current Melbourne City Centre to include bordering areas such as Melbourne Docklands and Southbank.

The Melbourne City Centre is also a major financial hub being the corporate headquarters of two of the world's largest mining companies: BHP Billiton and Rio Tinto; a large gaming company: Tabcorp, largest communications company: Telstra, largest transport company: Toll. It has played host to a number of significant single national and international events, which include: the first sitting of the Parliament of Australia in 1901, 1956 Summer Olympics, Commonwealth Heads of Government Meeting in 1981, World Economic Forum in 2000, 2006 Commonwealth Games and 2006 G20 Ministerial Meeting. The city centre is also renowned for hosting a large number of annual events, many being the biggest in Australia and the World.