The 2005 New York City mayoral election occurred on Tuesday, November 8, 2005, with incumbent Republican mayor Michael Bloomberg soundly defeating former Bronx borough president Fernando Ferrer, the Democratic nominee. Several third-party candidates also ran for mayor. Bloomberg won four of the five boroughs, the exception being the Bronx.

Ruth Wyler Messinger is a former American political leader in New York City and a member of the Democratic Party. She was the Democratic nominee for Mayor of New York City in 1997, losing to incumbent mayor Rudy Giuliani.