Arizona's 9th congressional district was created as a result of the 2010 census. The first candidates ran in the 2012 House elections, and the first representative was seated for the 113th Congress in 2013. Formerly located in the Phoenix area, the 9th district has been in western Arizona since 2023.

Paul Anthony Gosar is an American far-right politician and dentist who has represented Arizona's 9th congressional district in the U.S. House of Representatives since 2023 and represented Arizona's 4th congressional district from 2013 to 2023. A Republican, he was elected in 2010 to represent the neighboring 1st congressional district until redistricting. Gosar's support of conspiracy theories, his extreme opposition to abortion and contraception, his alleged connections to Holocaust deniers, and his alleged ties to far-right militant groups such as the Proud Boys and Oath Keepers, have sparked controversy.