| Election Name: | 1942 United States Senate special election in Minnesota |
| Country: | Minnesota |
| Flag Year: | 1893 |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1936 United States Senate election in Minnesota |
| Previous Year: | 1936 |
| Next Election: | 1942 United States Senate election in Minnesota |
| Next Year: | 1942 |
| Election Date: | November 3, 1942 |
| Image1: | ArthurNelson.jpg |
| Nominee1: | Arthur E. Nelson |
| Party1: | Republican Party (Minnesota) |
| Popular Vote1: | 372,240 |
| Percentage1: | 56.12% |
| Nominee2: | Al Hansen |
| Party2: | Farmer–Labor Party (Minnesota) |
| Popular Vote2: | 177,008 |
| Percentage2: | 26.68% |
| Image3: | 3x4.svg |
| Nominee3: | John E. O'Rourke |
| Party3: | Democratic Party of Minnesota |
| Popular Vote3: | 114,086 |
| Percentage3: | 17.20% |
| Map Size: | 250px |
| U.S. senator | |
| Before Party: | Republican Party (Minnesota) |
| After Party: | Republican Party (Minnesota) |
The 1942 United States Senate special election in Minnesota took place on November 3, 1942. The election was held to fill the vacancy in the seat formerly held by the late Ernest Lundeen for the final two months of Lundeen's unexpired term. Governor Harold Stassen had appointed Joseph H. Ball to fill the seat in 1940, but this appointment was temporary and subject to a special election held in the next general election year thereafter—1942. Ball opted to run for the full six-year term immediately following the end of Lundeen's term, instead of running for election to continue for the remainder of the term. In Ball's stead, the Republican Party of Minnesota nominated Arthur E. Nelson, who, in the special election, defeated both of his challengers—Al Hansen of the Farmer–Labor Party of Minnesota and John E. O'Rourke of the Minnesota Democratic Party.
Following his 1940 appointment and subsequent election, Ball ultimately served the longest tenure of any Senator only elected once.