2017 Western Australian state election
The 2017 Western Australian state election was held on Saturday 11 March 2017 to elect members to the Parliament of Western Australia, including all 59 seats in the Legislative Assembly and all 36 seats in the Legislative Council. The eight-and-a-half-year two-term incumbent Liberal–WA National government, led by Premier Colin Barnett, was defeated in a landslide by the Labor opposition, led by Opposition Leader Mark McGowan.

Labor won 41 of the 59 seats in the Legislative Assembly—a 12-seat majority. This was WA Labor's strongest performance in a state election at the time, and formed the largest majority government and seat tally in Western Australian parliamentary history until that point. Additionally, Labor exceeded all published opinion polling, winning 55.5 percent of the two-party-preferred vote from a state record landslide 12.8-point two-party swing. It was the worst defeat of a sitting government in Western Australia, as well as one of the worst defeats of a sitting state or territory government since Federation.

Labor also became the largest party in the Legislative Council with 14 of the 36 seats. The Labor government thus required at least five additional votes from non-government members to pass legislation.
Q3365500
Parliament of Western Australia
LOC
Q7987530
Legislative Assembly
MEDIA
Q2994118
Legislative Council
MEDIA
Q55616819
Liberal
ORG
Q6974821
WA National
ORG
Q1550276
Premier
PER
Q1446593
Colin Barnett
PER
Q56276763
Labor
ORG
Q7098620
opposition
UNK
Q6508572
Opposition Leader
PER
Q16197112
Mark McGowan
PER
Q6604005
Western Australian parliamentary history
UNK
None
published opinion polling
UNK
Q7858737
two-party-preferred vote
UNK
Q7658512
swing
UNK
Q7987594
2017 Western Australian state election
EVE
2017-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2017
DATE
2017-03-11T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
11 March 2017
DATE
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59
NUMBER
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36
NUMBER
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41
NUMBER
+59^^http://www.w3.org/2001/XMLSchema#decimal
59
NUMBER
+12^^http://www.w3.org/2001/XMLSchema#decimal
12
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55.5
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12.8
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14
NUMBER
+36^^http://www.w3.org/2001/XMLSchema#decimal
36
NUMBER
point in time
part of
part of
number of seats
number of seats
position held
member of political party