The 2017 New South Wales mayoral elections were held on 9 September 2017 to elect mayors or lord mayors to 13 of the 46 local government areas (LGAs) up for election in New South Wales. The elections were held as part of the statewide local elections.
While most mayors in New South Wales are elected by councillors at meetings, several choose to have directly elected (or popularly elected) mayors.
This was the last time the position of mayor of North Sydney was directly elected, as a referendum held on the same day as the local elections saw 52.4% of residents vote in favour of replacing the election with a vote from councillors. The change came into effect in 2021.
On 20 January 2014, Willoughby mayor Pat Reilly () died in hospital after a short sickness.
Although she finished in third place on first preferences, candidate Gail Giles-Gidney won the by-election on 12 April with 50.8% of the vote after preference distribution.
On 17 August 2014, Newcastle lord mayor Jeff McCloy () resigned following an Independent Commission Against Corruption inquiry into donations he made to Liberal Party candidates during his tenure as a property developer.
The subsequent by-election on 15 November was won by candidate Nuatali Nelmes.
Incumbents at the time of the elections are highlighted in bold text.