The 1998 Arizona House of Representatives election took place on Tuesday, November 3, 1998, with the primary election held on Tuesday, September 8, 1998. 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, Governor, and Arizona Senate.
Following the previous election in 1996, Republicans held a 38-to-22-seat majority over Democrats. Republicans expanded their majority in 1998, winning 40 seats. At 20 members, Democrats saw a net loss of two seats. The newly elected members served in the 44th Arizona State Legislature, during which Republican Jeff Groscost was re-elected as 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:
|- !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 |-
|- !colspan="5"|Democratic Party Primary Results |-
|- !colspan="5"|Democratic Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !colspan="5"|Democratic Party Primary Results |-
|- !colspan="5"|Libertarian 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 |-
|- !colspan="5"|Democratic 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"|Democratic Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !colspan="5"|Libertarian Party Primary Results |-
|- !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"|Republican Party Primary Results |-
|- !colspan="5"|Democratic Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !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"|Republican Party Primary Results |-
|- !colspan="5"|Democratic Party Primary Results |-
|- !colspan="5"|Republican 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"|Libertarian Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !colspan="5"|Democratic Party Primary Results |-
|- !colspan="5"|Reform Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !colspan="5"|Democratic Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !colspan="5"|Republican Party Primary Results |-
|- !colspan="5"|Democratic Party Primary Results |-