The City of Williamstown was a local government area about 10 kilometres (6 mi) southwest of Melbourne, the state capital of Victoria, Australia.

The city covered an area of 14.50 square kilometres (5.60 sq mi), and existed from 1919 until 1994.

[3] Council meetings were held in a variety of locations in Williamstown until a permanent home was constructed.

[4] The facility is still used for council meetings by the City of Hobsons Bay, although not as much as its Altona counterpart.

Commencing in 1916, the municipality ran its own electricity supply utility for a number of years, the first customer being connected in July 1917.