The 1956 Arizona Senate election was held on November 6, 1956. Voters elected all 28 members of the Arizona Senate to serve two-year terms. At the time, each of Arizona's 14 counties elected two state senators for a total of 28 members of the Arizona Senate. Primary elections were held on September 11, 1956.
Prior to the elections, the Democrats held a supermajority of 26 seats over the Republicans' 2 seats.
Following the election, Democrats maintained control of the chamber and kept their supermajority of 26 Democrats to 2 Republicans. The newly elected senators served in the 23rd Arizona State Legislature.