| Election Name: | 1877 United States Senate election in California |
| Type: | presidential |
| Ongoing: | no |
| Flag Image: | First Bear Flag of California (1846).svgborder |
| Previous Election: | 1871 United States Senate election in California |
| Previous Year: | 1871 |
| Next Election: | 1885 United States Senate election in California |
| Next Year: | 1885 |
| Election Date: | December 18, 1877 |
| Votes For Election: | Majority vote of each house needed to win |
| 1Blank: | Senate |
| 2Blank: | Percentage |
| 3Blank: | House |
| 4Blank: | Percentage |
| Image1: | James T. Farley 3x4.jpg |
| Nominee1: | James T. Farley |
| Party1: | Democratic Party (United States) |
| 1Data1: | 28 |
| 2Data1: | 70.00% |
| 3Data1: | 54 |
| 4Data1: | 69.23% |
| Nominee2: | Morris M. Estee |
| Party2: | Republican Party (United States) |
| 1Data2: | 12 |
| 2Data2: | 30.00% |
| 3Data2: | 24 |
| 4Data2: | 30.77% |
| Senator | |
| Before Election: | Aaron A. Sargent |
| Before Party: | Republican Party (United States) |
| After Election: | James T. Farley |
| After Party: | Democratic Party (United States) |
The 1877 United States Senate election in California was held on December 18, 1877, by the California State Legislature to elect a U.S. Senator (Class 3) to represent the State of California in the United States Senate. Democratic state senator James T. Farley was elected over Republican State Assemblyman Morris M. Estee.[1]