| Election Name: | 2008 Illinois House of Representatives election |
| Country: | Illinois |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2006 Illinois House of Representatives election |
| Previous Year: | 2006 |
| Next Election: | 2010 Illinois House of Representatives election |
| Next Year: | 2010 |
| Seats For Election: | All 118 seats in the Illinois House of Representatives |
| Majority Seats: | 60 |
| Leader1: | Michael Madigan |
| Party1: | Democratic Party (United States) |
| Leaders Seat1: | 22nd-Chicago |
| Last Election1: | 66 |
| Seats Before1: | 67 |
| Seats1: | 70 |
| Seat Change1: | 3 |
| Popular Vote1: | 2,785,589 |
| Percentage1: | 58.03% |
| Swing1: | 5% |
| Leader2: | Tom Cross |
| Party2: | Republican Party (United States) |
| Leaders Seat2: | 97th-Oswego |
| Last Election2: | 52 |
| Seats Before2: | 51 |
| Seats2: | 48 |
| Seat Change2: | 3 |
| Popular Vote2: | 1,949,123 |
| Percentage2: | 40.60% |
| Swing2: | 5.25% |
| Speaker | |
| Posttitle: | Speaker-Elect |
| Before Election: | Michael Madigan |
| Before Party: | Democratic Party (United States) |
| After Election: | Michael Madigan |
| After Party: | Democratic Party (United States) |
The Illinois House of Representatives elections of 2008 determined the membership of the lower house of the 96th General Assembly. The Democratic Party increased its Majority.
| Illinois State Senate Elections, 2008 | |||||||
|---|---|---|---|---|---|---|---|
| Party | Votes | Percentage | Seats before | Seats after | +/– | ||
| Democratic | 2,785,589 | 58.03% | 67 | 70 | +3 | ||
| Republican | 1,949,123 | 40.60% | 51 | 48 | align="right" | -3 | |
| Green | 65,647 | 1.30% | 0 | 0 | 0 | ||
| Independent | 36 | 0.0007% | 0 | 0 | 0 | ||
| Totals | 4,800,359 | 100.00% | 118 | 0 | 118 | ||