| Election Name: | 1888 Boston mayoral election |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1887 Boston mayoral election |
| Previous Year: | 1887 |
| Election Date: | December 12, 1888 |
| Next Election: | 1889 Boston mayoral election |
| Next Year: | 1889 |
| Image1: | Thomas N. Hart 5210004 015 029 (3x4a).jpg |
| Candidate1: | Thomas N. Hart |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 32,712 |
| Percentage1: | 51.48% |
| Candidate2: | Hugh O'Brien |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 30,836 |
| Percentage2: | 48.52% |
| Mayor | |
| Before Election: | Hugh O'Brien |
| Before Party: | Democratic Party (United States) |
| After Election: | Thomas N. Hart |
| After Party: | Republican Party (United States) |
The Boston mayoral election of 1888 saw the election of Thomas N. Hart, who defeated incumbent mayor Hugh O'Brien.