| Collie-Preston Western Australia—Legislative Assembly | |||||||||||||||
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 Location of Collie-Preston (dark green) in Western Australia | |||||||||||||||
| State | Western Australia | ||||||||||||||
| Dates current | 1901–present | ||||||||||||||
| MP | Jodie Hanns | ||||||||||||||
| Party | Labor | ||||||||||||||
| Namesake | Collie, Preston River | ||||||||||||||
| Electors | 30,741 (2021) | ||||||||||||||
| Area | 4,001 km2 (1,544.8 sq mi) | ||||||||||||||
| Demographic | Rural | ||||||||||||||
| Coordinates | 33°20′S 115°56′E / 33.34°S 115.94°E | ||||||||||||||
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Collie-Preston is a Legislative Assembly electorate in the state of Western Australia. While the seat was known as Collie for just over a century of its existence as an electorate, the seat was known as South West Mining from 1901 to 1904, and Collie-Wellington from 2005 to 2008. It is named for the South West coal mining town of Collie. While historically a very safe seat for the Labor Party, redistributions in 1988 and 2007 due to increases in the quota for country seats which had historically been malapportioned resulted in the seat incorporating surrounding rural shires which were hostile to Labor and thereby becoming more marginal.