| Election Name: | 1938 Dunedin mayoral election |
| Country: | New Zealand |
| Flag Image: | Dunedin city coa.gif |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1935 Dunedin mayoral election |
| Previous Year: | 1935 |
| Next Election: | 1941 Dunedin mayoral election |
| Next Year: | 1941 |
| Election Date: | 11 May 1938 |
| Turnout: | 32,032 |
| Party Name: | no |
| Candidate1: | Andrew Allen |
| Party1: | Citizens' |
| Color1: | 6495ED |
| Popular Vote1: | 17,929 |
| Percentage1: | 55.97 |
| Candidate2: | Edwin Cox |
| Party2: | Labour |
| Popular Vote2: | 13,891 |
| Percentage2: | 43.36 |
| Mayor | |
| Before Election: | Edwin Cox |
| After Election: | Andrew Allen |
The 1938 Dunedin mayoral election was part of the New Zealand local elections held that same year. In 1938, elections were held for the Mayor of Dunedin plus other local government positions including twelve city councillors. The polling was conducted using the standard first-past-the-post electoral method.
Edwin Cox, the incumbent Mayor, sought re-election for a third term, a feat never before achieved in Dunedin. Cox was unsuccessful in this and was beaten by Andrew Allen.