| Election Name: | Iowa State Senate elections, 2006 |
| Country: | Iowa |
| Flag Image: | Flag of Iowa (variant).svg |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2004 Iowa Senate election |
| Previous Year: | 2004 |
| Next Election: | 2008 Iowa Senate election |
| Next Year: | 2008 |
| Seats For Election: | 25 out of 50 seats in the Iowa State Senate |
| Majority Seats: | 26 |
| Election Date: | November 7, 2006 |
| Leader1: | Jack Kibbie |
| Party1: | Democratic Party (United States) |
| Leaders Seat1: | 4th |
| Last Election1: | 25 |
| Seats Before1: | 25 |
| Seat Change1: | 5 |
| Seats After1: | 30 |
| Leader2: | Jeff Lamberti |
| Party2: | Republican Party (United States) |
| Leaders Seat2: | 35th (retired) |
| Last Election2: | 25 |
| Seats Before2: | 25 |
| Seat Change2: | 5 |
| Seats After2: | 20 |
| Map Size: | 350px |
| President(s) of the Senate | |
| Before Election: | Jack Kibbie & Jeff Lamberti[1] |
| Before Party: | Democratic & Republican, respectively |
| After Party: | Democratic |
The 2006 Iowa Senate election was held on November 7, 2006. The Senate seats for the twenty-five odd-numbered districts were up for election. Senate terms are staggered such that half the membership is elected every two years. Senators serve four-year terms. Prior to the election, the Senate was evenly divided between Republicans and Democrats. Following the election, the Democrats were in the majority - this marked the first time in 42 years that the Democrats had controlled both branches of the Iowa General Assembly and the Governor's Office.[2]
| Iowa Senate: pre-election | Seats | |
| Republican-held | 25 | |
| Democratic-held | 25 | |
| Total | 50 | |
| 2006 Elections | ||
| Democratic held and uncontested | 15 | |
| Contested | 18 | |
| Republican held and uncontested | 17 | |
| Total | 50 | |
| Iowa Senate: post-election | Seats | |
| Democratic-held | 30 | |
| Republican-held | 20 | |
| Total | 50 | |
Final results from the Iowa Secretary of State:[3]