| Election Name: | 1849 Boston mayoral election |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1848 Boston mayoral election |
| Previous Year: | 1848 |
| Election Date: | December 10, 1849 |
| Next Election: | 1850 Boston mayoral election |
| Next Year: | 1850 |
| Image1: | John P. Bigelow 5210004 015 012 (3x4).jpg |
| Candidate1: | John P. Bigelow |
| Party1: | Whig Party (United States) |
| Popular Vote1: | 4,543 |
| Percentage1: | 80.68% |
| Candidate2: | Joseph Hall |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 705 |
| Percentage2: | 12.52% |
| Image3: | 3x4.svg |
| Candidate3: | Bradford Sumner |
| Party3: | Free Soil Party |
| Popular Vote3: | 349 |
| Percentage3: | 6.20% |
| Mayor | |
| Before Election: | John P. Bigelow |
| Before Party: | Whig Party (United States) |
| After Election: | John P. Bigelow |
| After Party: | Whig Party (United States) |
The 1849 Boston mayoral election saw the reelection of incumbent Whig mayor John P. Bigelow. It was held on December 10, 1849.