| Election Name: | 1966 Connecticut gubernatorial election |
| Country: | Connecticut |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1962 Connecticut gubernatorial election |
| Previous Year: | 1962 |
| Next Election: | 1970 Connecticut gubernatorial election |
| Next Year: | 1970 |
| Election Date: | November 8, 1966 |
| Nominee1: | John N. Dempsey |
| Party1: | Democratic Party (United States) |
| Running Mate1: | Attilio R. Frassinelli |
| Popular Vote1: | 561,599 |
| Percentage1: | 55.68% |
| Nominee2: | E. Clayton Gengras |
| Party2: | Republican Party (United States) |
| Running Mate2: | John L. Gerardo |
| Popular Vote2: | 446,536 |
| Percentage2: | 44.28% |
| Map Size: | 200px |
| Governor | |
| Before Election: | John N. Dempsey |
| Before Party: | Democratic Party (United States) |
| After Election: | John N. Dempsey |
| After Party: | Democratic Party (United States) |
The 1966 Connecticut gubernatorial election was held on November 8, 1966. Incumbent Democrat John N. Dempsey defeated Republican nominee E. Clayton Gengras with 55.68% of the vote.
This was the first gubernatorial election since the state constitution was amended in 1962 to have both the Governor and Lieutenant Governor run on the same ticket in the general election.