The 1958 United States Senate election in California was held on November 4, 1958.
Incumbent Senator William F. Knowland opted not to run for re-election, choosing instead to run for election as Governor. Incumbent Governor Goodwin Knight exchanged places with Knowland and lost to U.S. Representative Clair Engle in the midst of a national landslide for the Democratic Party. This was one of a record twelve seats Democrats gained from the Republican Party.
- George Christopher, Mayor of San Francisco
- William Jolley
- Goodwin Knight, Governor of California
- Alexander Williamson
|Democratic||Clair Engle (cross-filing)||173,845||10.80%|
|Republican||Alexander D. Williamson||53,273||3.31%|
|Republican||Goodwin Knight (cross-filing)||385,170||17.51%|
|Republican||George Christopher (cross-filing)||221,783||10.08%|
|Write-in||Jesse M. Ritchie||892||0.02%||N/A|
|Write-in||Ray B. Pollard||281||0.01%||N/A|
- "CA US Senate - R Primary". OurCampaigns. Retrieved 12 August 2019.
- "CA US Senate - D Primary". OurCampaigns. Retrieved 12 August 2019.
- OurCampaigns <ID> https://www.ourcampaigns.com/RaceDetail.html?RaceID=<ID>. Retrieved 12 August 2019. Missing or empty