This is a list of electoral results for the Electoral district of Williamstown in Victorian state elections.
| Member | Party | Term | ||
|---|---|---|---|---|
| John Foster | Unaffiliated | 1856–1857 | ||
| George Perry | Unaffiliated | 1857–1859 | ||
| George Frederic Verdon | Liberal | 1859–1868 | ||
| Thomas Mason | Unaffiliated | 1868–1871 | ||
| Alfred Clark | Liberal | 1871–1887 | ||
| James Mirams | Liberal | 1887–1889 | ||
| William Carter | Labor | 1889–1894 | ||
| James Styles | Labor | 1894–1900 | ||
| Alexander Ramsay | Liberal | 1900–1904 | ||
| John Lemmon | Labor | 1904–1955 | ||
| Larry Floyd | Labor | 1955–1973 | ||
| Gordon Stirling | Labor | 1973–1988 | ||
| Joan Kirner | Labor | 1988–1994 | ||
| Steve Bracks | Labor | 1994–2007 | ||
| Wade Noonan | Labor | 2007–2018 | ||
| Melissa Horne | Labor | 2018–present | ||