In the 1863 Iowa State Senate elections, Iowa voters elected state senators to serve in the tenth Iowa General Assembly. Following the downsizing of the Iowa Senate from 49 to 46 seats in 1863, elections were held for 34 of the state senate's 46 seats. State senators serve four-year terms in the Iowa State Senate. The general election took place in 1863. To claim control of the chamber from Republicans, the Democrats needed to net seven Senate seats.