Benjamin F. Gue[c] Republican John Scott[d] Republican In the 1867 Iowa State Senate elections, Iowa voters elected state senators to serve in the twelfth Iowa General Assembly.

Following the expansion of the Iowa Senate from 48 to 49 seats in 1867, elections were held for 34 of the state senate's 49 seats.

The general election took place on October 8, 1867.

To claim control of the chamber from Republicans, the Democrats needed to net 19 Senate seats.

[a] Source:[10] District boundaries were redrawn before the 1867 general election for the Iowa Senate: