Andrew G. Frommelt Democratic Andrew G. Frommelt Democratic The 1966 Iowa State Senate elections took place as part of the biennial 1966 United States elections.

At this time, the Iowa Senate still had several multi-member districts.

The Iowa Senate was expanded from 59 to 61 members and new district maps were drawn for the 1966 election.

The Iowa General Assembly provides statewide maps of each district.

To claim control of the chamber from Democrats, the Republicans needed to net 6 Senate seats.