|Area:||5.5 km (2.1 sq mi)|
|Location:||8 km (5 mi) from Melbourne|
|Local Government Area:||City of Hobsons Bay|
Williamstown is a suburb in Melbourne, Victoria, Australia, 8 km south-west from Melbourne's central business district. Its Local Government Area is the City of Hobsons Bay. At the 2006 Census, Williamstown had a population of 12,733.
Williamstown is approximately 15 minutes by car from Melbourne via the West Gate Freeway or a 30-minute train journey from Flinders Street Station. Ferries from Melbourne's Southgate Arts & Leisure Precinct take approximately 1 hour.