| Election Name: | 2012 Illinois House of Representatives election |
| Country: | Illinois |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2010 Illinois House of Representatives election |
| Previous Year: | 2010 |
| Next Election: | 2014 Illinois House of Representatives election |
| Next Year: | 2014 |
| 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: | 64 |
| Seats1: | 71 |
| Seat Change1: | 7 |
| Popular Vote1: | 2,294,402 |
| Percentage1: | 51.35% |
| Swing1: | 0.73% |
| Leader2: | Tom Cross |
| Party2: | Republican Party (United States) |
| Leaders Seat2: | 84th-Oswego |
| Last Election2: | 54 |
| Seats2: | 47 |
| Seat Change2: | 7 |
| Popular Vote2: | 2,137,826 |
| Percentage2: | 47.85% |
| Swing2: | 0.16% |
| 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 2012 Elections for the Illinois House of Representatives was conducted on Tuesday, November 6, 2012. State Representatives are elected for two-year terms, with the entire House of Representatives up for a vote every two years.[1] The votes were as close as to the previous election, but the Democrats were able to win "3/5 of the seats in the House of Representatives (a supermajority in Illinois)".[2] https://ballotpedia.org/Michael_J._Madigan
| Illinois State House Elections, 2010 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Party | Votes | Percentage | Candidates | Seats before | Seats after | +/– | ||
| Democratic | 2,294,402 | 51.35% | 87 | 64 | 71 | +7 | ||
| Republican | 2,137,826 | 47.85% | 78 | 54 | 47 | align="right" | -7 | |
| Independent | 18,392 | 0.41% | 1 | 0 | 0 | 0 | ||
| 10th District Unity Party | 15,007 | 0.34% | 1 | 0 | 0 | 0 | ||
| Constitution | 1,483 | 0.03% | 1 | 0 | 0 | 0 | ||
| Write-Ins | 629 | 0.01% | 12 | 0 | 0 | 0 | ||
| Totals | 4,467,739 | 100.00% | 180 | 118 | 118 | — | ||