| Election Name: | 1857 Iowa gubernatorial election |
| Country: | Iowa |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1854 Iowa gubernatorial election |
| Previous Year: | 1854 |
| Next Election: | 1859 Iowa gubernatorial election |
| Next Year: | 1859 |
| Election Date: | 13 October 1857 |
| Nominee1: | Ralph P. Lowe |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 38,498 |
| Percentage1: | 50.93% |
| Nominee2: | Ben M. Samuels |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 36,088 |
| Percentage2: | 47.74% |
| Map Size: | 240px |
| Governor | |
| Before Election: | James W. Grimes |
| Before Party: | Whig Party (United States) |
| After Election: | Ralph P. Lowe |
| After Party: | Republican Party (United States) |
The 1857 Iowa gubernatorial election was held on 13 October 1857 in order to elect the Governor of Iowa. Republican nominee Ralph P. Lowe defeated Democratic nominee Ben M. Samuels and American Party nominee W. T. Henry.[1] Marking the first time the recently formed Republican Party won the Iowa Governorship. It was also the first gubernatorial election held under the 1857 Iowa constitution.
On election day, 13 October 1857, Republican nominee Ralph P. Lowe won the election by a margin of 2,410 votes against his foremost opponent Democratic nominee Ben M. Samuels, thereby gaining Republican control over the office of Governor. Lowe was sworn in as the 4th Governor of Iowa on 14 January 1858.[2]