Josiah Quincy Democratic Thomas N. Hart Republican The Boston mayoral election of 1899 occurred on Tuesday, December 12, 1899.

Incumbent mayor Josiah Quincy (a Democrat) had announced in July 1899 that he would not seek re-election.

[1] Hart benefitted from strife within the Democratic party, where John R. Murphy had lost the nomination to Collins.

[3] The votes of Murphy and his followers in support of the Republican candidate contributed to Collins' defeat, and was referred to as a "knifing" in contemporary news reports.

Former Mayor Thomas N. Hart defeated former common councilor, alderman, and state representative Alpheus Sanford.