William E. Leffingwell[a] Democratic Maturin L. Fisher[b] Democratic In the 1854 Iowa State Senate elections, Iowa voters elected state senators to serve in the fifth Iowa General Assembly.

Elections were held for 19 of the state senate's 31 seats.

To claim control of the chamber from Democrats, the Whigs needed to net 5 Senate seats.

Democrats maintained control of the Iowa State Senate following the 1854 general election with the balance of power shifting to Democrats holding 17 seats and Whigs having 14 seats (a net gain of 3 seats for Whigs).

[b][a] Source:[11] District boundaries for the Iowa Senate in 1854: