| Election Name: | 1931 Auckland City mayoral election |
| Country: | New Zealand |
| Flag Image: | Coat of arms of Auckland.svg |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1929 Auckland City mayoral election |
| Previous Year: | 1929 |
| Next Election: | 1933 Auckland City mayoral election |
| Next Year: | 1933 |
| Election Date: | 8 May 1931 |
| Turnout: | 21,634 (44.87%) |
| Candidate1: | George Hutchison |
| Party1: | Citizens Committee |
| Color1: | 00529F |
| Popular Vote1: | 12,799 |
| Percentage1: | 59.16 |
| Candidate2: | Rex Mason |
| Party2: | New Zealand Labour Party |
| Popular Vote2: | 8,598 |
| Percentage2: | 39.74 |
| Mayor | |
| Before Election: | George Baildon |
| After Election: | George Hutchison |
The 1931 Auckland City mayoral election was part of the New Zealand local elections held that same year. In 1931, elections were held for the Mayor of Auckland plus other local government positions including twenty-one city councillors. The polling was conducted using the standard first-past-the-post electoral method.