| Election Name: | 2012 California State Assembly election |
| Country: | California |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2010 California State Assembly election |
| Previous Year: | 2010 |
| Next Election: | 2014 California State Assembly election |
| Next Year: | 2014 |
| Seats For Election: | All 80 seats in the California State Assembly |
| Majority Seats: | 41 |
| Election Date: | November 6, 2012 |
| Image1: | John Pérez 2011 (cropped).jpg |
| Leader1: | John Pérez |
| Party1: | California Democratic Party |
| Leader Since1: | March 1, 2010 |
| Leaders Seat1: | 53rd–Los Angeles |
| Last Election1: | 52 seats, 54.27% |
| Seats1: | 55 |
| Seat Change1: | 3 |
| Popular Vote1: | 6,835,701 |
| Percentage1: | 58.46% |
| Swing1: | 4.19% |
| Leader2: | Connie Conway |
| Party2: | California Republican Party |
| Leader Since2: | December 6, 2010 |
| Leaders Seat2: | 26th–Tulare |
| Last Election2: | 28 seats, 43.67% |
| Seats2: | 25 |
| Seat Change2: | 3 |
| Popular Vote2: | 4,765,952 |
| Percentage2: | 40.76% |
| Swing2: | 2.91% |
| Speaker | |
| Before Election: | John Pérez |
| Before Party: | California Democratic Party |
| After Election: | John Pérez |
| After Party: | California Democratic Party |
The 2012 California State Assembly elections took place on November 6, 2012, with a primary election held on June 5, 2012. Voters in all 80 of California's state assembly districts voted for their representative. The Democrats gained three seats from the Republicans, winning 55 seats and securing a two-thirds supermajority in the chamber.
| California State Assembly elections, 2012 Primary election — June 5, 2012 | |||||||
|---|---|---|---|---|---|---|---|
| Party | Votes | Percentage | Candidates | Advancing to general | Seats contesting | ||
| Democratic | 2,481,326 | 52.27% | 144 | 84 | 73 | ||
| Republican | 2,147,125 | 45.23% | 114 | 72 | 65 | ||
| No party preference | 88,523 | 1.86% | 9 | 1 | 1 | ||
| Green | 18,063 | 0.38% | 3 | 0 | 0 | ||
| Libertarian | 9,871 | 0.21% | 2 | 0 | 0 | ||
| Peace and Freedom | 2,055 | 0.04% | 2 | 1 | 1 | ||
| Valid votes | 4,746,963 | 89.09% | — | — | — | ||
| Invalid votes | 581,333 | 10.91% | — | — | — | ||
| Totals | 5,328,296 | 100.00% | 274 | 158 | — | ||
| Voter turnout | 31.06% | ||||||
| California State Assembly elections, 2012 General election — November 6, 2012 | ||||||
|---|---|---|---|---|---|---|
| Party | Votes | Percentage | Seats | +/– | ||
| Democratic | 6,835,701 | 58.46% | 55 | 3 | ||
| Republican | 4,765,952 | 40.76% | 25 | 2 | ||
| No party preference | 66,239 | 0.57% | 0 | 1 | ||
| Peace and Freedom | 25,167 | 0.22% | 0 | |||
| Valid votes | 11,693,059 | 88.57% | — | — | ||
| Invalid votes | 1,509,099 | 11.43% | — | — | ||
| Totals | 13,202,158 | 100.00% | 80 | — | ||
| Voter turnout | 72.36% | |||||
| 55 | 25 | |
| Democratic | Republican | |