| Post: | Deputy Premier |
| 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 the Premier and Cabinet |
| 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: | 7 December 1955 |
| First: | John Tonkin |
The deputy premier of Western Australia is a role in the Government of Western Australia assigned to a responsible Minister in the Australian state of Western Australia. It has second ranking behind the premier of Western Australia in Cabinet, and its holder serves as acting premier during absence or incapacity of the premier. The role was only formally established on 7 December 1955, but had existed in practice since the earliest days of responsible government.
| No. | Name | width=60 | Portrait | Term of office | ||
|---|---|---|---|---|---|---|
| 1 | John Tonkin | 7 December 1955 | 2 April 1959 | |||
| 2 | Arthur Watts | 2 April 1959 | 31 January 1962 | |||
| 3 | Crawford Nalder | 1 February 1962 | 3 March 1971 | |||
| 4 | Herb Graham | 3 March 1971 | 30 May 1973 | |||
| 5 | Don Taylor | 30 May 1973 | 8 April 1974 | |||
| 6 | Ray McPharlin | 8 April 1974 | 20 May 1975 | |||
| 7 | Des O'Neil | 5 June 1975 | 5 March 1980 | |||
| 8 | Ray O'Connor | 5 March 1980 | 25 January 1982 | |||
| 9 | Cyril Rushton | 25 January 1982 | 25 February 1983 | |||
| 10 | Mal Bryce | 25 February 1983 | 25 February 1988 | |||
| 11 | David Parker | 25 February 1988 | 13 February 1990 | |||
| 12 | Ian Taylor | 13 February 1990 | 16 February 1993 | |||
| 13 | Hendy Cowan | 16 February 1993 | 16 February 2001 | |||
| 14 | Eric Ripper | 16 February 2001 | 23 September 2008 | |||
| 15 | Kim Hames | 23 September 2008 | 16 February 2016 | |||
| 16 | Liza Harvey | 16 February 2016 | 17 March 2017 | |||
| 17 | Roger Cook | 17 March 2017 | 8 June 2023 | |||
| 18 | Rita Saffioti | 8 June 2023 | present | |||