| Election Name: | 1931 Mississippi Democratic gubernatorial primary runoff |
| Type: | presidential |
| Country: | Mississippi |
| Flag Image: | Flag of Mississippi (1894-1996).svg |
| Previous Election: | 1927 Mississippi gubernatorial election |
| Previous Year: | 1927 |
| Next Election: | 1935 Mississippi gubernatorial election |
| Next Year: | 1935 |
| Ongoing: | no |
| Election Date: | November 3, 1931 |
| Image1: | File:MS Gov Conner.jpg |
| Nominee1: | Martin S. Conner |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 170,690 |
| Percentage1: | 54.08% |
| Nominee2: | Hugh L. White |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 144,918 |
| Percentage2: | 45.92% |
| Map Size: | 250px |
| Governor | |
| Before Election: | Theodore G. Bilbo |
| Before Party: | Democratic Party (United States) |
| After Election: | Martin S. Conner |
| After Party: | Democratic Party (United States) |
The 1931 Mississippi gubernatorial election took place on November 3, 1931, in order to elect the Governor of Mississippi. Incumbent Democrat Theodore G. Bilbo was term-limited, and could not run for reelection to a second term. As was common at the time, the Democratic candidate ran unopposed in the general election, so therefore the Democratic primary was the real contest, and winning the primary was considered tantamount to election.
No candidate received a majority in the Democratic primary, which featured four contenders, so a runoff was held between the top two candidates. The runoff election was won by former state representative Martin S. Conner, who defeated Mayor of Columbia Hugh L. White.
In the general election, Conner ran unopposed.