The 2018 Arizona House of Representatives election took place on Tuesday, November 6, 2018, with the primary election held on Tuesday, August 28, 2018. Arizona voters elected all 60 members of the Arizona House of Representatives in multi-member districts to serve two-year terms.
The election coincided with United States national elections and Arizona state elections, including U.S. Senate, U.S. House, Arizona governor and Arizona Senate.
Following the previous election in 2016, Republicans held a 35-to-25-seat majority over Democrats. Republicans maintained their majority in 2018, though the GOP majority narrowed to 31 seats. At 29 members, Democrats experienced a net gain of four seats. The newly elected members served in the 54th Arizona State Legislature, during which Republican Russell W. "Rusty" Bowers was elected Speaker of the Arizona House.
Italics denote an open seat held by the incumbent party; bold text denotes a gain for a party.
Sources for election results:
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|- !colspan="5"|Republican Party primary results |-
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|- !colspan="5"|Republican Party primary results |-
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|- !colspan="5"|Republican Party primary results |-
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|- !colspan="5"|Republican Party primary results |-
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|- !colspan="5"|Republican Party primary results |-
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|- !colspan="5"|Republican Party primary results |-
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|- !colspan="5"|Republican Party primary results |-
|- !colspan="5"|Democratic Party primary results |-
|- !colspan="5"|Republican Party primary results |-
|- !colspan="5"|Democratic Party primary results |-
|- !colspan="5"|Democratic Party primary results |-
|- !colspan="5"|Republican Party primary results |-
|- !colspan="5"|Republican Party primary results |-
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|- !colspan="5"|Libertarian Party primary results |-
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|- !colspan="5"|Democratic Party primary results |-
|- !colspan="5"|Republican Party primary results |-