| Election Name: | 1866 Michigan gubernatorial election |
| Country: | Michigan |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1864 Michigan gubernatorial election |
| Previous Year: | 1864 |
| Next Election: | 1868 Michigan gubernatorial election |
| Next Year: | 1868 |
| Election Date: | November 6, 1866 |
| Nominee1: | Henry H. Crapo |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 97,112 |
| Percentage1: | 58.59% |
| Nominee2: | Alpheus S. Williams |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 68,650 |
| Percentage2: | 41.42% |
| Map Size: | 300px |
| Governor | |
| Before Election: | Henry H. Crapo |
| Before Party: | Republican Party (United States) |
| After Election: | Henry H. Crapo |
| After Party: | Republican Party (United States) |
The 1866 Michigan gubernatorial election was held on November 6, 1866. Incumbent Republican Henry H. Crapo defeated Democratic nominee Alpheus S. Williams with 58.59% of the vote.
Major party candidates