The 1974 United States Senate election in Wisconsin was held on November 5, 1974. Incumbent Democratic U.S. Senator Gaylord Nelson won re-election to a third term.
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 County results Nelson: 50–60% 60–70% 70–80% 80–90% Petri: 50–60% 60–70% | |||||||||||||||||
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Major candidates edit
Democratic edit
- Gaylord Nelson, incumbent U.S. Senator since 1963
Republican edit
- Tom Petri, State Senator since 1973
Results edit
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | Gaylord Nelson (incumbent) | 740,700 | 61.75% | +0.06% | |
| Republican | Tom Petri | 429,327 | 35.79% | -2.52% | |
| American | Gerald L. McFarren | 24,003 | 2.00% | N/A | |
| Lowering the Property Tax | Roman Blenski | 5,396 | 0.45% | N/A | |