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 Ernest Lundeen for the final two months of Lundeen's unexpired term. GovernorHarold 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.