The 1984 Arizona Senate election was held on November 6, 1984. Voters elected members of the Arizona Senate in all 30 of the state's legislative districts to serve a two-year term. Primary elections were held on September 11, 1984.
Prior to the elections, the Republicans held a majority of 18 seats over the Democrats' 12 seats.
Following the election, Republicans maintained control of the chamber and their majority of 18 Republicans to 12 Democrats remained unchanged.
The newly elected senators served in the 37th Arizona State Legislature.