John Herron Republican William N. McNair Democratic The Mayoral election of 1933 in Pittsburgh, Pennsylvania was held on Tuesday, November 6, 1933.

Herron had been elevated to the executive office from his position as city council president after Charles H. Kline resigned due to a fiscal scandal.

Democrats, led by new powerful grassroots organizer David Lawrence (a future mayor), selected William McNair, an idealistic and outspoken attorney as their candidate.

As the New Deal began, Pittsburgh's strong labor community moved rapidly toward the Democrats, creating a huge shift in voting patterns and allowing McNair to win.

Incumbent mayor John Herron won a divided Republican Primary against Councilman Peter J. McArdle and Register of Wills Joseph Mackrell.