| Post: | Treasurer |
| Body: | Western Australia |
| Flag: | Flag of Western Australia.svg |
| Flagsize: | 120px |
| Flagcaption: | Flag of Western Australia |
| Insignia: | Western Australian Coat of Arms.svg |
| Insigniasize: | 120px |
| Insigniacaption: | Western Australian Coat of Arms |
| Incumbent: | Rita Saffioti |
| Incumbentsince: | 8 June 2023 |
| Department: | Department of Treasury |
| Style: | The Honourable |
| Reports To: | Premier of Western Australia |
| Seat: | Dumas House, Perth |
| Nominator: | Premier of Western Australia |
| Appointer: | Governor of Western Australia |
| Appointer Qualified: | on the advice of the premier |
| Termlength: | At the Governor's pleasure |
| Formation: | 29 January 1890 |
| First: | Sir John Forrest |
The Treasurer of Western Australia is the title held by the Cabinet Minister who is responsible for the management of Western Australia's public sector finances, and for preparing and delivering the annual State Budget. With only rare exceptions, until 2001, the position of Treasurer was usually held by the Premier of Western Australia.
Up until the government of Philip Collier in 1924, the position was called Colonial Treasurer.[1]
| Treasurer | Party | Assumed office | Left office | Term | |
|---|---|---|---|---|---|
| (none) | 1838 | 1848 | 10 years | ||
| none | 1856 | December 1890 | |||
| (pro-Forrest)1 | 29 December 1890 | 15 February 1901 | |||
| (pro-Forrest)1 | 15 February 1901 | 27 May 1901 | |||
| Opposition1 | 27 May 1901 | 21 November 1901 | |||
| Ministerialist1 | 21 November 1901 | 23 December 1901 | |||
| Frederick Illingworth | Opposition1 | 23 December 1901 | 1 July 1902 | ||
| Opposition1 | 1 July 1902 | 20 April 1904 | |||
| Opposition1 | 20 April 1904 | 10 August 1904 | |||
| 10 August 1904 | 25 August 1905 | ||||
| Ministerialist | 25 August 1905 | 7 May 1906 | |||
| Ministerialist | 7 May 1906 | 30 June 1909 | |||
| Ministerialist | 30 June 1909 | 16 September 1910 | |||
| Frank Wilson | Ministerialist | 16 September 1910 | 7 October 1911 | ||
| Labor | 7 October 1911 | 27 July 1916 | |||
| Frank Wilson | 27 July 1916 | 28 June 1917 | |||
| James Gardiner | 28 June 1917 | 2 April 1919 | |||
| 2 April 1919 | 17 April 1919 | ||||
| Nationalist | 17 April 1919 | 17 May 1919 | |||
| Nationalist | 17 May 1919 | 16 April 1924 | |||
| Labor | 16 April 1924 | 24 April 1930 | |||
| Sir James Mitchell | Nationalist | 24 April 1930 | 24 April 1933 | ||
| Philip Collier | Labor | 24 April 1933 | 20 August 1936 | ||
| Labor | 20 August 1936 | 31 July 1945 | |||
| Labor | 31 July 1945 | 1 April 1947 | |||
| 1 April 1947 | 23 February 1953 | ||||
| Labor | 23 February 1953 | 2 April 1959 | |||
| Liberal | 2 April 1959 | 3 March 1971 | |||
| Labor | 3 March 1971 | 12 October 1971 | |||
| Labor | 12 October 1971 | 8 April 1974 | |||
| Liberal | 8 April 1974 | 25 January 1982 | |||
| Liberal | 25 January 1982 | 19 February 1983 | |||
| Labor | 19 February 1983 | 25 February 1988 | |||
| Labor | 25 February 1988 | 12 February 1990 | |||
| Labor | 12 February 1990 | 16 February 1993 | |||
| Liberal | 16 February 1993 | 10 February 2001 | |||
| Labor | 16 February 2001 | 23 September 2008 | |||
| Liberal | 23 September 2008 | 27 April 2010 | |||
| Liberal | 27 April 2010 | 14 December 2010 | |||
| Liberal | 14 December 2010 | 12 June 2012 | |||
| Colin Barnett | Liberal | 12 June 2012 | 7 July 2012 | ||
| Troy Buswell | Liberal | 7 July 2012 | 10 March 2014 | ||
| Colin Barnett | Liberal | 10 March 2014 | 17 March 2014 | ||
| Liberal | 17 March 2014 | 17 March 2017 | |||
| Labor | 17 March 2017 | 18 March 2021 | |||
| Labor | 18 March 2021 | 8 June 2023 | 2 years, 82 days | ||
| Labor | 8 June 2023 | present |