| Election Name: | 2014 California State Senate election |
| Country: | California |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2012 California State Senate election |
| Previous Year: | 2012 |
| Next Election: | 2016 California State Senate election |
| Next Year: | 2016 |
| Seats For Election: | 20 seats from even-numbered districts in the California State Senate |
| Majority Seats: | 21 |
| Leader1: | Kevin de León |
| Party1: | California Democratic Party |
| Leaders Seat1: | 24th–Los Angeles |
| Seats Before1: | 28 |
| Seats After1: | 26 |
| Seat Change1: | 2 |
| Popular Vote1: | 1,760,892 |
| Percentage1: | 56.22% |
| Leader2: | Bob Huff |
| Party2: | California Republican Party |
| Leaders Seat2: | 29th–Diamond Bar |
| Seats Before2: | 12 |
| Seats After2: | 14 |
| Seat Change2: | 2 |
| Popular Vote2: | 1,371,020 |
| Percentage2: | 43.78% |
| Map Size: | 450px |
| President pro tempore | |
| Posttitle: | President pro tempore-designate |
| Before Election: | Kevin de León |
| Before Party: | California Democratic Party |
| After Election: | Kevin de León |
| After Party: | California Democratic Party |
| Last Election1: | 29 |
| Last Election2: | 11 |
The 2014 California State Senate election was held on Tuesday, November 4, 2014, with the primary election on June 3, 2014. Voters in the 20 even-numbered districts of the California State Senate elected their representatives. The elections coincided with the elections for other offices, including the State Assembly election and the gubernatorial election.
The California Republican Party won the newly drawn 28th district and the open 34th district, gaining two seats from the California Democratic Party and ending the Democrats' supermajority in the chamber.
| California State Senate elections, 2014 Primary election — June 3, 2014 | |||||||
|---|---|---|---|---|---|---|---|
| Party | Votes | Percentage | Candidates | Advancing to general | Seats contesting | ||
| Democratic | 923,557 | 51.63% | 40 | 24 | 19 | ||
| Republican | 828,207 | 46.30% | 23 | 16 | 15 | ||
| No party preference | 32,763 | 1.83% | 3 | 0 | 0 | ||
| Green | 4,392 | 0.25% | 1 | 0 | 0 | ||
| Totals | 1,788,919 | 100.00% | 67 | 40 | — | ||
| California State Senate elections, 2014 General election — November 4, 2014 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Party | Votes | Percentage | Not up | Contested | Before | After | +/– | ||
| Democratic | 1,760,892 | 56.22% | 15 | 13 | 28 | 26 | 2 | ||
| Republican | 1,371,020 | 43.78% | 5 | 7 | 12 | 14 | 2 | ||
| Totals | 3,131,912 | 100.00% | 20 | 20 | 40 | 40 | — | ||
| 26 | 14 | ||
| Democratic | Republican | ||
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