A by-election was held for the New South Wales Legislative Assembly electorate of Parramatta on 11 October 1856 because Henry Parker had been appointed Premier and Colonial Secretary, forming the Parker ministry.
|3 October 1856||Henry Parker was appointed Premier and Colonial Secretary.|
|3 October 1856||Writ of election issued by the Speaker of the Legislative Assembly.|
|10 October 1856||Nominations|
|11 October 1856||Polling day|
|20 October 1856||Return of writ|
|Henry Parker (re-elected)||279||51.9|
|Total formal votes||538||100.0|
- "Sir Henry Watson Parker (1808–1881)". Former Members of the Parliament of New South Wales. Retrieved 11 May 2019.
- "Writ of election: Parramatta". New South Wales Government Gazette. No. 152. 4 October 1856. p. 2617. Retrieved 31 August 2020 – via Trove.
- Green, Antony. "1856 Parramatta by-election". New South Wales Election Results 1856-2007. Parliament of New South Wales. Retrieved 10 January 2021.