| Election Name: | 1940 United States Senate election in Vermont |
| Country: | Vermont |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1934 United States Senate election in Vermont |
| Previous Year: | 1934 |
| Next Election: | 1946 United States Senate election in Vermont |
| Next Year: | 1946 |
| Image1: | Austin Warren Robinson.jpg |
| Nominee1: | Warren Austin |
| Party1: | Republican Party (US) |
| Popular Vote1: | 93,283 |
| Percentage1: | 66.45% |
| Party2: | Democratic Party (US) |
| Nominee2: | Ona Searles |
| Popular Vote2: | 47,101 |
| Percentage2: | 33.55% |
| Map Size: | 219px |
| U.S. Senator | |
| Before Election: | Warren Austin |
| Before Party: | Republican Party (US) |
| After Election: | Warren Austin |
| After Party: | Republican Party (US) |
The 1940 United States Senate election in Vermont took place on November 5, 1940. Incumbent Republican Warren Austin successfully ran for re-election to another term in the United States Senate, defeating Democratic candidate Ona S. Searles. Austin would resign in August 1946 to become United States Ambassador to the United Nations; Ralph Flanders was appointed to replace him and went on to win election to a full term in 1946.