| Election Name: | 1986 Connecticut gubernatorial election |
| Country: | Connecticut |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1982 Connecticut gubernatorial election |
| Previous Year: | 1982 |
| Next Election: | 1990 Connecticut gubernatorial election |
| Next Year: | 1990 |
| Election Date: | November 4, 1986 |
| Image1: | W A ONeill (cropped).jpg |
| Nominee1: | Bill O'Neill |
| Running Mate1: | Joseph J. Fauliso |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 575,638 |
| Percentage1: | 57.93% |
| Nominee2: | Julie Belaga |
| Running Mate2: | E. Clayton Gengras, Jr. |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 408,489 |
| Percentage2: | 41.11% |
| Governor | |
| Before Election: | Bill O'Neill |
| Before Party: | Democratic Party (United States) |
| After Election: | Bill O'Neill |
| After Party: | Democratic Party (United States) |
The 1986 Connecticut gubernatorial election took place on November 4, 1986. Incumbent Democratic governor Bill O'Neill won his second full term against Republican assemblywoman Julie Belaga, who defeated Jerry Labriola for the Republican nomination. This election marked the last time a Democrat would win the governorship in Connecticut until the 2010 election, the last time a Democratic gubernatorial candidate has won every county in the state and the last time a Democrat won by a margin of larger than 5 percent until the 2022 election.