| Election Name: | 1857 United States Senate election in California |
| Type: | presidential |
| Ongoing: | no |
| Flag Image: | First Bear Flag of California (1846).svgborder |
| Previous Election: | 1852 United States Senate special election in California |
| Previous Year: | 1852 (special) |
| Next Election: | 1860 United States Senate special election in California |
| Next Year: | 1860 (special) |
| Election Date: | January 10, 1857 |
| Votes For Election: | Majority vote of both houses needed to win |
| 1Blank: | Joint session |
| 2Blank: | Percentage |
| Image1: | David C. Broderick - Brady-Handy Crop.jpg |
| Nominee1: | David C. Broderick |
| Party1: | Democratic Party (United States) |
| 1Data1: | 79 |
| 2Data1: | 70.54% |
| Nominee2: | James W. Coffroth |
| Party2: | Know Nothing |
| 1Data2: | 17 |
| 2Data2: | 15.18% |
| Image3: | Edward Stanly by Brady Crop.jpg |
| Nominee3: | Edward Stanly |
| Party3: | Republican Party (United States) |
| 1Data3: | 14 |
| 2Data3: | 12.50% |
| Senator | |
| Before Election: | John B. Weller |
| Before Party: | Democratic Party (United States) |
| After Election: | David C. Broderick |
| After Party: | Democratic Party (United States) |
The 1857 United States Senate election in California was held on January 10, 1857, by the California State Legislature to elect a U.S. Senator (Class 1) to represent the State of California in the United States Senate. In a special joint session, former Democratic lieutenant governor David C. Broderick was elected over Know Nothing State Senator James W. Coffroth and Republican former congressman from North Carolina Edward Stanly.[1]