| Election Name: | 1940 United States Senate election in Connecticut |
| Country: | Connecticut |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1934 United States Senate election in Connecticut |
| Previous Year: | 1934 |
| Next Election: | 1946 United States Senate election in Connecticut |
| Next Year: | 1946 |
| Election Date: | November 5, 1940 |
| Image1: | File:FrancisMaloney.jpg |
| Nominee1: | Francis T. Maloney |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 416,740 |
| Percentage1: | 53.15% |
| Nominee2: | Paul L. Cornell |
| Party2: | Republican Party (United States) |
| Alliance2: | Union Party (United States) |
| Popular Vote2: | 358,313 |
| Percentage2: | 45.70% |
| Map Size: | 200px |
| U.S. Senator | |
| Before Election: | Francis T. Maloney |
| Before Party: | Democratic Party (United States) |
| After Election: | Francis T. Maloney |
| After Party: | Democratic Party (United States) |
The United States Senate election of 1940 in Connecticut was held on November 5, 1940. Incumbent Democratic Senator Francis T. Maloney was re-elected to a second term in office. Maloney did not complete the term; he died in 1945. This was the first time that the Democrats were ever re-elected to the Senate from the state.