The Arizona Territorial Legislature was the legislative body of Arizona Territory. It was a bicameral legislature consisting of a lower house, the House of Representatives, and an upper house, the council. Created by the Arizona Organic Act, the legislature initially consisted of nine members in the council and eighteen members in the House. The legislature initially met once a year, but this was changed by the U.S. Congress to biannually in 1869. In 1881, the membership was expanded to twelve Council members and twenty-four Representatives.
The Arizona Territorial Legislature was replaced by the Arizona State Legislature after Arizona achieved statehood.