| Election Name: | 1886 Boston mayoral election |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1885 Boston mayoral election |
| Previous Year: | 1885 |
| Election Date: | December 14, 1886 |
| Next Election: | 1887 Boston mayoral election |
| Next Year: | 1887 |
| Image1: | Hugh O'Brien 5210004 015 028 (3x4a).jpg |
| Candidate1: | Hugh O'Brien |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 23,426 |
| Percentage1: | 51.30% |
| Candidate2: | Thomas N. Hart |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 18,686 |
| Percentage2: | 40.92% |
| Image3: | McNeill-George-E-1892 (1).jpg |
| Candidate3: | George E. McNeill |
| Party3: | Labor Party (United States, 19th century) |
| Popular Vote3: | 3,555 |
| Percentage3: | 7.79% |
| Mayor | |
| Before Election: | Hugh O'Brien |
| Before Party: | Democratic Party (United States) |
| After Election: | Hugh O'Brien |
| After Party: | Democratic Party (United States) |
The Boston mayoral election of 1886 saw the reelection of Hugh O'Brien to a third consecutive term.