| Country: | New South Wales |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 14 October 2017 |
| Image1: | Blacktown Mayor Stephen Bali (cropped).jpg |
| Leader1: | Stephen Bali |
| Party1: | Australian Labor Party |
| Popular Vote1: | 31,031 |
| Percentage1: | 71.6% |
| Swing1: | 17.7pp |
| Leader2: | Josh Green |
| Party2: | Christian Democrats |
| Popular Vote2: | 6,540 |
| Percentage2: | 15.1% |
| Swing2: | 9.1pp |
| 1Blank: | TPP |
| 2Blank: | TPP swing |
| 1Data1: | 82.3% |
| 2Data1: | 19.1pp |
| 1Data2: | 17.7% |
| 2Data2: | 17.7pp |
| MP | |
| Before Election: | John Robertson |
| Before Party: | Australian Labor Party |
| After Election: | Stephen Bali |
| After Party: | Australian Labor Party |
A by-election was held in the state electoral district of Blacktown on 14 October 2017. The by-election was triggered by the resignation of John Robertson .[1] Robertson served as state Leader of the Opposition from 2011 until 2014.
The by-election was held on the same day as by-elections Cootamundra and Murray.
The candidates in ballot paper order are as follows:[2]
| Candidate nominations | |||||
|---|---|---|---|---|---|
| width=20% colspan=2 | Party | Candidate | width=60% | Notes | |
| Christian Democratic Party (Fred Nile Group) | Josh Green | Contested state elections for Macquarie Fields in 2011 and Electoral district of Mount Druitt in 2015 and federal elections in Grayndler in 2013 and Chifley in 2016 | |||
| Labor | Stephen Bali | Resident of Doonside and incumbent Mayor of Blacktown and Blacktown councillor since 2004. Bali also serves as President of the New South Wales Branch and National Vice President of the Australian Workers' Union.[3] | |||
| Greens NSW | Chris Winslow | ||||
| Independent | Vivek Singha | ||||