Ed C. Sawyer[1] Democratic Leo Corbet[2] Republican 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.

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

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