| Election Name: | 1921 Invercargill mayoral election |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1919 Invercargill mayoral election |
| Previous Year: | 1919 |
| Next Election: | 1923 Invercargill mayoral election |
| Next Year: | 1923 |
| Election Date: | 27 April 1921 |
| Turnout: | 3,523 |
| Candidate1: | John Lillicrap |
| Party1: | Independent politician |
| Popular Vote1: | 2,143 |
| Percentage1: | 60.82 |
| Candidate2: | John Stead |
| Party2: | Independent politician |
| Popular Vote2: | 1,380 |
| Percentage2: | 39.17 |
| Mayor | |
| Before Election: | John Stead |
| After Election: | John Lillicrap |
The 1921 Invercargill mayoral election was held on 27 April 1921 as part of that year's local elections.
Incumbent mayor John Stead was defeated by councillor John Lillicrap.
The following table gives the election results: