2006 Arizona State Legislature election

The 48th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2007, to December 31, 2008, during the first two years of Janet Napolitano's second term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Democrats gained a seat in the Senate, leaving the Republicans with a 17-13 majority. The Republicans maintained their majority in the lower chamber, 33–27, even though the Democrats picked up 6 seats.

A political party is an organization that coordinates candidates to compete in a particular country's elections. It is common for the members of a party to hold similar ideas about politics, and parties may promote specific ideological or policy goals.

The Arizona State House of Representatives is the lower house of the Arizona Legislature, the state legislature of the U.S. state of Arizona. The upper house is the Senate. The House convenes in the legislative chambers at the Arizona State Capitol in Phoenix. Its members are elected to two-year terms, with a term limit of four consecutive terms. Each of the state's 30 legislative districts elects two state house representatives and one state senator, with each district having a population of at least 203,000.

The Arizona State Senate is part of the Arizona Legislature, the state legislature of the US state of Arizona. The Senate consists of 30 members each representing an average of 219,859 constituents. Members serve two-year terms with term limits that limit Senators to a maximum four consecutive terms before requiring a one-term respite prior to running again. Members of the Republican Party are currently the majority in the Senate. There are currently 16 women serving in the Senate after Raquel Terán was appointed, making it the first time a majority of the body was composed of female members.