| Election Name: | 1863 Connecticut gubernatorial election |
| Country: | Connecticut |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1862 Connecticut gubernatorial election |
| Previous Year: | 1862 |
| Next Election: | 1864 Connecticut gubernatorial election |
| Next Year: | 1864 |
| Election Date: | April 6, 1863 |
| Image1: | William Alfred Buckingham - Brady-Handy (3x4a).jpg |
| Nominee1: | William Alfred Buckingham |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 41,032 |
| Percentage1: | 51.64% |
| Nominee2: | Thomas H. Seymour |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 38,395 |
| Percentage2: | 48.32% |
| Map Size: | 220px |
| Governor | |
| Before Election: | William Alfred Buckingham |
| Before Party: | Republican Party (United States) |
| After Election: | William Alfred Buckingham |
| After Party: | Republican Party (United States) |
The 1863 Connecticut gubernatorial election was held on April 6, 1863. It was a rematch of the 1860 Connecticut gubernatorial election. Incumbent governor and Republican nominee William Alfred Buckingham defeated former governor and Democratic nominee Thomas H. Seymour with 51.64% of the vote.
Major party candidates