1978 Arizona Senate election

The 1978 Arizona Senate election was held on November 7, 1978. 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 12, 1978.

Prior to the elections, the Democrats held a majority of 16 seats over the Republicans' 14 seats.

Following the election, Republicans flipped control of the chamber and took a majority of 16 Republicans to 14 Democrats, a net gain of two seats for Republicans.

The newly elected senators served in the 34th Arizona State Legislature.

Democrat

 * 1) District 11: Frank J. Felix

Democrats

 * 1) District 2: Dr. Lewis J. McDonald
 * 2) District 10: Tom Moore

Democrats

 * 1) District 9: John J. Hutton
 * 2) District 12: Sue Dye
 * 3) District 16: Marcia Weeks

Republican

 * 1) District 21: Tim Hayes