| Election Name: | 1864 Connecticut gubernatorial election |
| Country: | Connecticut |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1863 Connecticut gubernatorial election |
| Previous Year: | 1863 |
| Next Election: | 1865 Connecticut gubernatorial election |
| Next Year: | 1865 |
| Election Date: | April 4, 1864 |
| Image1: | William Alfred Buckingham - Brady-Handy (3x4a).jpg |
| Nominee1: | William Alfred Buckingham |
| Party1: | National Union Party (United States) |
| Popular Vote1: | 39,820 |
| Percentage1: | 53.65% |
| Nominee2: | Origen S. Seymour |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 34,162 |
| Percentage2: | 46.02% |
| Map Size: | 220px |
| Governor | |
| Before Election: | William Alfred Buckingham |
| Before Party: | Republican Party (United States) |
| After Election: | William Alfred Buckingham |
| After Party: | National Union Party (United States) |
The 1864 Connecticut gubernatorial election was held on April 4, 1864, and the first of two gubernatorial elections in which the Republicans adopted the National Union Party name, as the national party had done during the 1864 presidential election. Incumbent governor and National Union nominee William Alfred Buckingham defeated Democratic nominee Origen S. Seymour with 53.65% of the vote.
Major party candidates