Altona is a suburb of Melbourne, Victoria, Australia, 13 km south-west of Melbourne's central business district. Its local government area is the City of Hobsons Bay. At the 2011 census, Altona had a population of 9,918.
Altona is a large suburb consisting of low density residential in the south-eastern half, with mixed industry in the north-western half. A key feature is Altona Beach on Port Phillip, which is one of only two swimming beaches in the western suburbs (the other being Williamstown Beach).
Altona takes its name from the then independent German city of Altona which is today a borough of Hamburg.