The Boston mayoral election of 2017 was held on Tuesday, November 7, 2017, to elect the mayor of Boston, Massachusetts. Incumbent Democratic mayor Marty J. Walsh won re-election to a second term, defeating District 7 City Councilor Tito Jackson, and two long-shot candidates, Robert Cappucci and Joseph Wiley.

Martin Joseph Walsh is an American politician and trade union official who served as the mayor of Boston from 2014 to 2021 and as the 29th United States Secretary of Labor from 2021 to 2023. A member of the Democratic Party, Walsh resigned from his position as the US Secretary of Labor in March 2023 in order to accept a position as executive director of the National Hockey League Players' Association. Before his mayoralty, he served as a member of the Massachusetts House of Representatives, representing the 13th Suffolk district from 1997 until 2014. As a trade union member, Walsh worked his way up to serve as the head of the Boston Building Trades Council from 2011 until 2013.