| Election Name: | 1940 United States Senate special election in Vermont |
| Country: | Vermont |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1938 United States Senate election in Vermont |
| Previous Year: | 1938 |
| Next Election: | 1944 United States Senate election in Vermont |
| Next Year: | 1944 |
| Image1: | GeorgeAiken-VTSEN- (cropped).jpg |
| Nominee1: | George Aiken |
| Party1: | Republican Party (US) |
| Popular Vote1: | 87,150 |
| Percentage1: | 61.63% |
| Party2: | Democratic Party (US) |
| Nominee2: | Herbert B. Comings |
| Popular Vote2: | 54,263 |
| Percentage2: | 38.37% |
| Map Size: | 219px |
| U.S. Senator | |
| Before Election: | Ernest W. Gibson, Jr. |
| Before Party: | Republican Party (US) |
| After Election: | George Aiken |
| After Party: | Republican Party (US) |
The 1940 United States Senate special election in Vermont took place on November 5, 1940. Republican George Aiken was elected to the United States Senate to serve the remainder of the deceased Ernest W. Gibson, Sr.'s term, defeating Democratic candidate Herbert B. Comings. Aiken replaced Gibson's son, Ernest W. Gibson, Jr., who was appointed to fill the seat until a special election could be held.