| Election Name: | 1958 United States Senate election in Connecticut |
| Country: | Connecticut |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1952 United States Senate election in Connecticut |
| Previous Year: | 1952 |
| Next Election: | 1964 United States Senate election in Connecticut |
| Next Year: | 1964 |
| Election Date: | November 4, 1958 |
| Nominee1: | Thomas J. Dodd |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 554,841 |
| Percentage1: | 57.29% |
| Nominee2: | William A. Purtell |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 410,622 |
| Percentage2: | 42.40% |
| U.S. Senator | |
| Before Election: | William A. Purtell |
| Before Party: | Republican Party (US) |
| After Election: | Thomas J. Dodd |
| After Party: | Democratic Party (US) |
The United States Senate election of 1958 in Connecticut was held on November 4, 1958. Democratic Thomas J. Dodd defeated incumbent senator William A. Purtell who ran for a second term.
This was one of ten 15 Democrats gained from the Republican Party in 1958, part of a record swing.