| Election Name: | 1865 Ohio gubernatorial election |
| Country: | Ohio |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1863 Ohio gubernatorial election |
| Previous Year: | 1863 |
| Next Election: | 1867 Ohio gubernatorial election |
| Next Year: | 1867 |
| Election Date: | October 10, 1865 |
| Nominee1: | Jacob Dolson Cox |
| Party1: | National Union Party (United States) |
| Popular Vote1: | 223,633 |
| Percentage1: | 53.53% |
| Nominee2: | George W. Morgan |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 193,797 |
| Percentage2: | 46.39% |
| Map Size: | 210px |
| Governor | |
| Before Election: | Charles Anderson |
| Before Party: | National Union Party (United States) |
| After Election: | Jacob Dolson Cox |
| After Party: | National Union Party (United States) |
The 1865 Ohio gubernatorial election was held on October 10, 1865. National Union nominee Jacob Dolson Cox defeated Democratic nominee George W. Morgan with 53.53% of the vote.