The electoral region of South West is a multi-member electoral region of the Western Australian Legislative Council the South West, Peel and part of the Great Southern regions of the state. It was created by the Acts Amendment (Electoral Reform) Act 1987, and became effective on 22 May 1989 with seven members who had been elected at the 1989 state election three months earlier. At the 2008 election, it was reduced to six members. The region includes the cities of Albany, Bunbury and Mandurah.
The Region is made up of several complete Legislative Assembly districts, which change at each distribution.
Albany, Bunbury, Collie, Mandurah, Mitchell, Murray, Stirling, Vasse, Warren, Wellington (10)