Melbourne is in Australia, a country in the Pacific.
Australia . Australia is a member of the United Nations , G20 , Commonwealth of Nations , ANZUS , Organisation for Economic Co-operation and Development ( OECD ) , World Trade Organization , Asia-Pacific Economic Cooperation , and the Pacific Islands Forum . Melbourne . It is a leading financial centre in the Asia-Pacific region , and ranks among the top 30 cities in the world in the Global Financial Centres Index . Melbourne is also home to Australia 's most extensive freeway network and has the world 's largest urban tram network .