| Election Name: | 2005 Western Australian state election |
| Country: | Western Australia |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 2001 Western Australian state election |
| Previous Year: | 2001 |
| Next Election: | 2008 Western Australian state election |
| Next Year: | 2008 |
| Seats For Election: | All 57 seats in the Western Australian Legislative Assembly and all 34 seats in the Western Australian Legislative Council 29 Assembly seats were needed for a majority |
| Leader1: | Geoff Gallop |
| Party1: | Australian Labor Party (Western Australian Branch) |
| Leaders Seat1: | Victoria Park |
| Percentage1: | 41.88% |
| Swing1: | 4.65 |
| Popular Vote1: | 448,956 |
| Last Election1: | 32 seats |
| Seats1: | 32 |
| Leader2: | Colin Barnett |
| Party2: | Liberal Party of Australia (Western Australian Division) |
| Leaders Seat2: | Cottesloe |
| Percentage2: | 35.64% |
| Swing2: | 4.48 |
| Popular Vote2: | 382,014 |
| Last Election2: | 16 seats |
| Seats2: | 18 |
| Seat Change2: | 2 |
| Leader3: | Max Trenorden |
| Party3: | National Party of Australia (WA) |
| Leaders Seat3: | Avon |
| Percentage3: | 3.69% |
| Swing3: | 0.43 |
| Popular Vote3: | 39,548 |
| Last Election3: | 5 seats |
| Seats3: | 5 |
| 1Blank: | TPP |
| 2Blank: | TPP swing |
| 1Data1: | 52.28% |
| 2Data1: | 0.65 |
| 1Data2: | 47.72% |
| 2Data2: | 0.65 |
| Map Size: | 400px |
| Premier | |
| Before Election: | Geoff Gallop |
| Before Party: | Australian Labor Party (Western Australian Branch) |
| After Election: | Geoff Gallop |
| After Party: | Australian Labor Party (Western Australian Branch) |
Elections were held in the state of Western Australia on 26 February 2005 to elect all 57 members to the Legislative Assembly and all 34 members to the Legislative Council. The Labor government, led by Premier Geoff Gallop, won a second term in office against the Liberal Party, led by Opposition Leader Colin Barnett.
See also: Results of the Western Australian state election, 2005 (Legislative Assembly). |}
Notes:
The Independent member for Pilbara, Larry Graham, and the Independent member for South Perth, Phillip Pendal, both retired at the 2005 election. The seats returned to the Labor and Liberal parties respectively.
See also: Results of the Western Australian state election, 2005 (Legislative Council).
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Notes:
By the time of the 2005 election, the One Nation Party actually held no seats, as the three members elected in 2001 election had resigned to sit as independents, later joining the New Country Party. None managed to retain their seats.
| Seat | Pre-2005 | Swing | Post-2005 | ||||||||
| Party | Member | Margin | Margin | Member | Party | ||||||
| Bunbury | Labor | Tony Dean | 0.2 | 0.8 | 0.6 | John Castrilli | Liberal | ||||
| Central Kimberley-Pilbara | Independent | Larry Graham | 16.2 | N/A | 13.8* | Tom Stephens | Labor | ||||
| Greenough | Liberal | Jamie Edwards | 0.9 | 12.6 | 11.7 | Grant Woodhams | National | ||||
| Kingsley | Liberal | Cheryl Edwardes | 2.5 | 3.6 | 1.1 | Judy Hughes | Labor | ||||
| Murray | Labor | notional | 0.7 | 1.2 | 0.5 | Murray Cowper | Liberal | ||||
| South Perth | Independent | Phillip Pendal | 14.1 | N/A | 6.0* | John McGrath | Liberal | ||||
| Roe | National | Ross Ainsworth | 21.7 | 25.0 | 3.3 | Graham Jacobs | Liberal | ||||