Electoral district of Thornlie

Thornlie Western Australia—Legislative Assembly
Location of Thornlie (dark green) in the Perth metropolitan area
State	Western Australia
Dates current	1989–2005, 2017–present
MP	Chris Tallentire
Party	Labor
Namesake	Thornlie
Electors	28,269 (2017)
Area	28 km2 (10.8 sq mi)
Demographic	East Metropolitan

Thornlie is an electoral district of the Legislative Assembly of Western Australia. It is located in Perth's southeastern suburbs, and is named after the suburb of Thornlie.

Thornlie was first created for the 1989 state election. It was abolished in a redistribution prior to the 2005 election, but was recreated for the 2017 election to replace the abolished seat of Gosnells. Thornlie currently has a notional 1.8-point majority for the Labor Party (based on the results of the 2013 election), and is considered a marginal seat.

Thornlie was first created for the 1989 state election. It largely replaced the abolished district of Gosnells and was won by incumbent Gosnells MP Yvonne Henderson. It was held at all times by the Labor Party.

The district was abolished ahead of the 2005 state election. At that time, it included the entirety of the suburbs of Thornlie and Langford as well as parts of the suburbs of Canning Vale, Ferndale, Kenwick, Lynwood and Maddington. Its territory was divided between the existing districts of Riverton and Southern River, as well as the new district of Kenwick. Sitting MP Sheila McHale contested and won the seat of Kenwick.