| Election Name: | 1865 Boston mayoral election |
| Type: | Presidential |
| Ongoing: | no |
| Previous Election: | 1864 Boston mayoral election |
| Previous Year: | 1864 |
| Election Date: | December 11, 1865 |
| Next Election: | 1866 Boston mayoral election |
| Next Year: | 1866 |
| Image1: | Frederic W. Lincoln Jr. 5210004 015 016 (3x4c).jpg |
| Candidate1: | Frederic W. Lincoln Jr. |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 5,806 |
| Percentage1: | 61.10% |
| Candidate2: | Nathaniel B. Shurtleff |
| Party2: | Democratic Party (United States) |
| Popular Vote2: | 3,690 |
| Percentage2: | 38.83% |
| Mayor | |
| Before Election: | Frederic W. Lincoln Jr. |
| Before Party: | Republican Party (United States) |
| After Election: | Frederic W. Lincoln Jr. |
| After Party: | Republican Party (United States) |
The Boston mayoral election of 1865 saw Frederic W. Lincoln Jr. reelected to a seventh overall term.
In late-November, Mayor Frederic W. Lincoln Jr. accepted renomination for the mayoralty.[1]
A week before the election, Nathaniel B. Shurtleff was unanimously nominated by the city's Democratic Party at its convention (held at Young's Hotel) after having been selected by the party's Committee of Conference as its recommended candidate. He was also nominated on the Citizens and Workingmen's tickets, the Citizens' convention (held at the Parker House) and Workingmen's Convention (held at the city's insolvency courtroom) both agreeing to nominate identical slates of candidates.[2]