William Crowther (1834 – 15 March 1900) was a Mayor of Auckland and then Member of Parliament for Auckland, New Zealand. Crowther was Mayor of Auckland from 1891 to 1893, after serving as a city councillor for sixteen years. Crowther represented the City of Auckland multi-member electorate first as a Liberal Party then independent conservative from 1893 to 1900, when he died of stomach cancer, aged 66. The resulting by-election on 27 April 1900 was hotly contested, and won by Joseph Witheford.