| Election Name: | 1890 Boston mayoral election |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1889 Boston mayoral election |
| Previous Year: | 1889 |
| Election Date: | December 9, 1890 |
| Next Election: | 1891 Boston mayoral election |
| Next Year: | 1891 |
| Image1: | Nathan Matthews Jr. 5210004 015 030 (3x4a).jpg |
| Candidate1: | Nathan Matthews Jr. |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 32,210 |
| Percentage1: | 59.37% |
| Candidate2: | Moody Merrill |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 19,957 |
| Percentage2: | 36.78% |
| Mayor | |
| Before Election: | Thomas N. Hart |
| Before Party: | Republican Party (United States) |
| After Election: | Nathan Matthews Jr. |
| After Party: | Democratic Party (United States) |
The Boston mayoral election of 1890 saw the election of Nathan Matthews Jr. Incumbent Mayor Thomas N. Hart was defeated for the Republican nomination by Moody Merrill.[1]