The 1964 United States Senate election in Delaware took place on November 3, 1964. Incumbent Republican U.S. Senator John J. Williams was narrowly re-elected to a fourth term in office over Democratic Governor Elbert Carvel in a rematch of the 1958 campaign.
- Elbert Carvel, Governor of Delaware (Democratic)
- Joseph B. Hollon (Socialist Labor)
- John J. Williams, incumbent U.S. Senator (Republican)
|Republican||John J. Williams (incumbent)||103,782||51.71%||1.57|
|Socialist Labor Party (United States)||Joseph B. Hollon||71||0.04%||N/A|