| Election Name: | 1805 Connecticut gubernatorial election |
| Country: | Connecticut |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1804 Connecticut gubernatorial election |
| Previous Year: | 1804 |
| Next Election: | 1806 Connecticut gubernatorial election |
| Next Year: | 1806 |
| Election Date: | April 11, 1805 |
| Nominee1: | Jonathan Trumbull Jr. |
| Party1: | Federalist Party (United States) |
| Popular Vote1: | 12,700 |
| Percentage1: | 61.47% |
| Nominee2: | William Hart |
| Party2: | Democratic-Republican Party (United States) |
| Popular Vote2: | 7,810 |
| Percentage2: | 37.80% |
| Map Size: | 220px |
| Governor | |
| Before Election: | Jonathan Trumbull Jr. |
| Before Party: | Federalist Party (United States) |
| After Election: | Jonathan Trumbull Jr. |
| After Party: | Federalist Party (United States) |
The 1805 Connecticut gubernatorial election took place on April 11, 1805. Incumbent Federalist Governor Jonathan Trumbull Jr. won re-election to an eighth full term, defeating Democratic-Republican candidate William Hart in a re-match of the previous year's election.