1864 Boston mayoral election

The 1864 Boston mayoral election was held on December 12, 1864 and saw Frederic W. Lincoln Jr. reelected to a sixth overall term.

Campaign
Mayor Frederic W. Lincoln Jr. was renominated by the Republican Party, which ran under the "Union Republican" banner amid the ongoing American Civil War. Lincoln's opponent, Thomas Coffin Amory, accepted the nomination of the Democratic Party in a letter that was read on his behalf to the December 2, 1864 meeting of the city's Democratic Ward and City Committee.

The Boston Evening Transcript characterized Mayor Lincoln as a strong front-runner, writing on December 3, 1864, "there can be no doubt ever of the triumphant re-election of Mayor Lincoln and his associates on the Union Republican ticket." After the election, the Boston Evening Transcript wrote that the election of Lincoln and the Union Republican nominees for other municipal offices had been a "foregone conclusion".

Results
The Boston Evening Transcript described the margins of the victory received Lincoln and his fellow Union Republican nominees for city offices were, "extraordinarily large". It also characterized the turnout for the election as, "small" when compared to that of the 1864 United States presidential election that was held in November.