| Election Name: | 1970 United States Senate election in Wisconsin |
| Country: | Wisconsin |
| Flag Year: | 1913 |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1964 United States Senate election in Wisconsin |
| Previous Year: | 1964 |
| Next Election: | 1976 United States Senate election in Wisconsin |
| Next Year: | 1976 |
| Election Date: | November 3, 1970 |
| Nominee1: | William Proxmire |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 948,445 |
| Percentage1: | 70.83% |
| Nominee2: | John E. Erickson |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 381,297 |
| Percentage2: | 28.48% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | William Proxmire |
| Before Party: | Democratic Party (United States) |
| After Election: | William Proxmire |
| After Party: | Democratic Party (United States) |
The 1970 United States Senate election in Wisconsin was held on November 3, 1970. Incumbent Democrat William Proxmire was easily re-elected to a third term in office over Republican John E. Erickson, taking more than 70% of the vote, and defeating Erickson by more than 42 percentage points.