| Election Name: | 1912 South Dakota gubernatorial election |
| Country: | South Dakota |
| Flag Year: | 1909 |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1910 South Dakota gubernatorial election |
| Previous Year: | 1910 |
| Next Election: | 1914 South Dakota gubernatorial election |
| Next Year: | 1914 |
| Election Date: | November 5, 1912 |
| Image1: | File:FrankMByrne.jpg |
| Nominee1: | Frank M. Byrne |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 57,161 |
| Percentage1: | 48.51% |
| Nominee2: | Edwin S. Johnson |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 53,850 |
| Percentage2: | 45.70% |
| Map Size: | 250px |
| Governor | |
| Before Election: | Robert S. Vessey |
| Before Party: | Republican Party (United States) |
| After Election: | Frank M. Byrne |
| After Party: | Republican Party (United States) |
The 1912 South Dakota gubernatorial election was held on November 5, 1912. Incumbent Republican Governor Robert S. Vessey declined to run for re-election to a third term. Lieutenant Governor Frank M. Byrne won the Republican primary to succeed Vessey, and then faced State Senator Edwin S. Johnson, the Democratic nominee, in the general election. Byrne only narrowly defeated Johnson, winning just 49% of the vote to Johnson's 46%, the closest gubernatorial election since 1898.
Primary elections were held on June 4, 1912.