| Election Name: | 1988 California State Senate election |
| Country: | California |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 1986 California State Senate election |
| Previous Year: | 1986 |
| Next Election: | 1990 California State Senate election |
| Next Year: | 1990 |
| Seats For Election: | 20 seats from odd-numbered districts in the California State Senate |
| Majority Seats: | 21 |
| Image1: | David Roberti, 1971.jpg |
| Leader1: | David Roberti |
| Party1: | California Democratic Party |
| Leaders Seat1: | 23rd–Los Angeles |
| Seats Before1: | 25 |
| Seats After1: | 25 |
| Popular Vote1: | 1,079,543 |
| Percentage1: | 58.13% |
| Leader2: | Kenneth L. Maddy |
| Party2: | California Republican Party |
| Leaders Seat2: | 14th–Fresno |
| Seats Before2: | 14 |
| Seats After2: | 14 |
| Popular Vote2: | 719,817 |
| Percentage2: | 39.24% |
| Map Size: | 300px |
| President pro tempore | |
| Posttitle: | President pro tempore-designate |
| Before Election: | David Roberti |
| Before Party: | California Democratic Party |
| After Election: | David Roberti |
| After Party: | California Democratic Party |
The 1988 California State Senate elections were held on November 8[1] in the twenty odd-numbered Senate districts. There was no change to the representation of the Democratic and Republican parties.
| California State Senate elections, 1988 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Party | Votes | Percentage | Not up | Incumbents | Open | Before | After | +/– | ||
| Democratic | 1,079,543 | 58.85% | 0 | 5 | 0 | 5 | 5 | 0 | ||
| Republican | 719,817 | 39.24% | 0 | 2 | 0 | 2 | 2 | 0 | ||
| Independent | 0 | 0.00% | 0 | 0 | 0 | 0 | 0 | 0 | ||
| Libertarian | 20,445 | 1.11% | 0 | 0 | 0 | 0 | 0 | 0 | ||
| Peace and Freedom | 14,611 | 0.80% | 0 | 0 | 0 | 0 | 0 | 0 | ||
| Totals | 1,834,416 | 100.00% | 0 | 7 | 0 | 7 | 7 | — | ||