United States Senate elections, 1956 Race summaries Races leading to the 85th Congress

| State_ | Incumbent | Party | Result_ | Candidates_ |
|---|---|---|---|---|
| Oregon | Wayne Morse | Democratic | Re-elected | Wayne Morse (Democratic) 54.2% , Douglas McKay (Republican) 45.8% |
| Pennsylvania | James H. Duff | Republican | Lost re-election , Democratic gain | Joseph S. Clark (Democratic) 50.1% , James H. Duff (Republican) 49.7% |
| South Carolina | Olin B. Johnston | Democratic | Re-elected | Olin B. Johnston (Democratic) Unopposed |
| South Carolina , Special: Class 2 | Thomas A. Wofford | Democratic | Appointee retired , Winner elected to finish term ending January 3, 1961 , Democratic hold | Strom Thurmond (Democratic) Unopposed |
| South Dakota | Francis Case | Republican | Re-elected | Francis Case (Republican) 50.8% , Kenneth Holum (Democratic) 49.2% |
| Utah | Wallace F. Bennett | Republican | Re-elected | Wallace F. Bennett (Republican) 54.0% , Alonzo F. Hopkin (Democratic) 46.0% |