| Election Name: | 1887 Invercargill mayoral by-election |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1886 Invercargill mayoral election |
| Previous Year: | 1886 |
| Next Election: | 1887 Invercargill mayoral election |
| Next Year: | 1887 |
| Election Date: | 10 June 1887 |
| Turnout: | 579 |
| Candidate1: | Edwin Alfred Tapper |
| Party1: | Independent politician |
| Popular Vote1: | 337 |
| Percentage1: | 58.20 |
| Candidate2: | Aaron Blacke |
| Party2: | Independent politician |
| Popular Vote2: | 242 |
| Percentage2: | 41.79 |
| Mayor | |
| Before Election: | Aaron Blacke (unofficial) |
| After Election: | Edwin Alfred Tapper |
The 1887 Invercargill mayoral by-election was held on 10 June 1887 to fill the vacancy left by the resignation of David Roche. Aaron Blacke had been appointed mayor by the council, but this was not done in strict accordance with the law, and Blacke is not included in official lists of Mayors of Invercargill.
Edwin Alfred Tapper was elected.
The following table gives the election results:[1]