In the city of Hamilton, New Zealand, elections were held for the offices of Mayor of Hamilton and twelve members of the Hamilton City Council (HCC) on 12 October 2013. They were held as part of the 2013 New Zealand local elections. Referendums on city water fluoridation and to determine voting method for electing city councillors in the future were held simultaneously. Postal ballots were issued to 97,259 registered voters, and were returned from 23 September to 12 October 2013. Across the city, 37,276 people cast votes, a voter turnout of 38.33%. Some voters chose not to vote in particular elections or referendums, so voter turnout in individual elections varies from this figure.