| Election Name: | 1889 South Dakota gubernatorial election |
| Country: | South Dakota |
| Type: | presidential |
| Ongoing: | no |
| Next Election: | 1890 South Dakota gubernatorial election |
| Next Year: | 1890 |
| Election Date: | October 1, 1889 |
| Image1: | File:Governor Arthur C Mellette.jpg |
| Nominee1: | Arthur C. Mellette |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 53,964 |
| Percentage1: | 69.36% |
| Nominee2: | P. F. McClure |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 23,840 |
| Percentage2: | 30.64% |
| Map Size: | 250px |
| Governor of Dakota Territory | |
| Before Election: | Arthur C. Mellette |
| Before Party: | Republican Party (United States) |
| After Election: | Arthur C. Mellette |
| After Party: | Republican Party (United States) |
The 1889 South Dakota gubernatorial election was held on October 1, 1889, to elect the first Governor of South Dakota. Territorial Governor Arthur C. Mellette received the Republican nomination and faced former Territorial Commissioner of Immigration P. F. McClure, the Democratic nominee, in the general election. Mellette defeated McClure in a landslide.
At the Republican convention in August 1889, Territorial Governor Arthur C. Mellette faced no opponents in the gubernatorial race and was nominated by acclamation.[1] The next week, at the Democratic convention, Adjutant General James W. Harden[2] was nominated for governor, but upon the nomination of Territorial Commissioner of Immigration P. F. McClure,[3] Harden's name was withdrawn and McClure was nominated by acclamation.[4]