1818 in Australia

The following lists events that happened during 1818 in Australia.

Incumbents

 * Monarch - George III

Governors
Governors of the Australian colonies:
 * Governor of New South Wales – Lachlan Macquarie
 * Lieutenant-Governor of Van Diemen's Land – Colonel William Sorell

Events

 * 8 January – Governor Macquarie accuses Samuel Marsden of conspiracy against him
 * 3 March – Throsby, Hume and Meehan discover an overland route to Jervis Bay
 * 19 April – Phillip Parker King discovers Port Essington
 * 28 May – John Oxley leaves Bathurst to explore along the Macquarie River
 * 1 October – At least six Wodiwodi people (an Aboriginal people) are killed by nine European settlers in the Minnamurra River massacre.
 * The Royal Tasmanian Botanical Gardens is first opened.

Births

 * 22 March – John Ainsworth Horrocks, pastoralist and explorer (born in the United Kingdom) (d. 1846)
 * 21 May – S. T. Gill, artist (born in the United Kingdom) (d. 1880)
 * 5 August - Sir Thomas Elder, South Australian politician and pastoralist (born in the United Kingdom) (d. 1897)
 * 13 August – Edward Wise, New South Wales Supreme Court judge (born in the United Kingdom) (d. 1865)
 * 5 September – Edmund Kennedy, explorer (born in the United Kingdom) (d. 1848)
 * Unknown – Eliza Winstanley, stage actress and writer (born in the United Kingdom) (d. 1882)