| Election Name: | 1859 Mississippi gubernatorial election |
| Type: | presidential |
| Previous Election: | 1857 Mississippi gubernatorial election |
| Previous Year: | 1857 |
| Next Election: | 1861 Mississippi gubernatorial election |
| Next Year: | 1861 |
| Ongoing: | no |
| Election Date: | October 3, 1859 |
| Nominee1: | John J. Pettus |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 34,559 |
| Percentage1: | 77.03% |
| Nominee2: | Harvey W. Walter |
| Party2: | Independent (United States) |
| Popular Vote2: | 10,308 |
| Percentage2: | 22.97% |
| Map Size: | 150px |
| Governor | |
| Before Election: | William McWillie |
| Before Party: | Democratic Party (United States) |
| After Election: | John J. Pettus |
| After Party: | Democratic Party (United States) |
The 1859 Mississippi gubernatorial election was held on October 3, 1859, to elect the governor of Mississippi. Former Democratic acting governor of Mississippi John J. Pettus defeated the independent candidate Harvey W. Walter.[1]
On election day, October 3, 1859, John J. Pettus won the election by a margin of 24,251 votes against his opponent Harvey W. Walter. Retaining democratic control of the office of governor and being sworn in as the 23rd Governor of Mississippi on November 21, 1859. Pettus' election by such a large margin, indicated that secession was becoming increasingly popular among Mississippians, as Pettus had campaigned as a strong supporter of secession of the South from the United States. Which he would end up fulfilling as Governor in 1861, marking this election as the final one before the outbreak of the American Civil War, which saw Mississippi become part of the Confederate States of America.[2]