1990 Arizona Senate election

The 1990 Arizona Senate election was held on November 6, 1990. 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, 1990.

Prior to the elections, the Republicans held a majority of 17 seats over the Democrats' 13 seats.

Following the election, Democrats flipped control of the chamber and took a majority of 17 Democrats to 13 Republicans, a net gain of four seats for Democrats.

The newly elected senators served in the 40th Arizona State Legislature.

Democrats

 * 1) District 2: Tony Gabaldon

Republicans

 * 1) District 12: John T. Mawhinney
 * 2) District 14: William J. "Bill" DeLong
 * 3) District 24: Pete Corpstein
 * 4) District 28: Robert B. Usdane

Republicans

 * 1) District 1: John Hays
 * 2) District 21: Jerry Gillespie

Democrats

 * 1) District 5: Jones Osborn

Republicans

 * 1) District 9: Jeffrey J. Hill
 * 2) District 16: Wayne Stump
 * 3) District 18: Leo Corbet
 * 4) District 25: Jacque Steiner