| Election Name: | 1869 Iowa Senate election |
| Country: | Iowa |
| Flag Image: | Flag of Iowa (variant).svg |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 1867 Iowa Senate election |
| Previous Year: | 1867 |
| Next Election: | 1871 Iowa Senate election |
| Next Year: | 1871 |
| Seats For Election: | 21 out of 50 seats in the Iowa State Senate |
| Majority Seats: | 26 |
| Election Date: | October 12, 1869 |
| Party1: | Republican Party (United States) |
| Last Election1: | 40 |
| Seats Before1: | 37 |
| Seat Change1: | 6 |
| Seats After1: | 43 |
| Party2: | Democratic Party (United States) |
| Last Election2: | 8 |
| Seats Before2: | 8 |
| Seat Change2: | 1 |
| Seats After2: | 7 |
| Party3: | People's Party (US) |
| Last Election3: | 1 |
| Seats Before3: | 1 |
| Seat Change3: | 1 |
| Seats After3: | 0 |
| President of the Iowa Senate | |
| Before Election: | John Scott |
| Before Party: | Republican Party (United States) |
| After Election: | Henry Clay Bulis |
| After Party: | Republican Party (United States) |
In the 1869 Iowa State Senate elections, Iowa voters elected state senators to serve in the thirteenth Iowa General Assembly. Following the expansion of the Iowa Senate from 49 to 50 seats in 1869, elections were held for 21 of the state senate's 50 seats. State senators serve four-year terms in the Iowa State Senate.
The general election took place on October 12, 1869.[1]
Following the previous election in 1867, Republicans had control of the Iowa Senate with 40 seats to Democrats' eight seats and a lone member from the People's Party. However, three changes occurred during the twelfth general assembly. In the tenth district, Republican Senator Charles Leopold Matthies died on October 16, 1868, causing a vacancy in his seat.[2] In the eighteenth district, Republican Senator John R. Needham died on July 9, 1868, causing a vacancy in his seat.[3] In the twenty-fourth district, Republican Senator William Penn Wolf resigned on March 3, 1869, causing a vacancy in his seat.[4] All three seats were left vacant until the next election. Therefore, by election day in 1869, the Republicans held 37 seats, the Democrats held 8 seats, there was a lone People's Party member, and three seats were vacant (all the vacancies had been held by Republicans).
To claim control of the chamber from Republicans, the Democrats needed to net 18 Senate seats.
Republicans maintained control of the Iowa State Senate following the election with the balance of power shifting to Republicans holding 43 seats and Democrats having seven seats (a net gain of 6 seats for Republicans).
Source:[5]
District boundaries were redrawn before the 1869 general election for the Iowa Senate: