1799 in Australia

The following lists events that happened during 1799 in Australia.

Leaders

 * Monarch - George III
 * Governor of New South Wales – John Hunter
 * Lieutenant-Governor of Norfolk Island – Philip Gidley King
 * Inspector of Public Works – Richard Atkins

Events

 * 7 January – Bass and Flinders complete their circumnavigation of Van Diemen's Land in sloop Norfolk.
 * 11 February – The gaol in Sydney is burned by arsonists.
 * 3 March – Hawkesbury River floods, killing one.
 * 12 March – Isaac Nichols is accused of stealing stolen goods and sentenced to 14 years on Norfolk Island; his sentence is suspended by Governor Hunter on 1 April
 * 8 July – Matthew Flinders leaves Port Jackson to explore the East coast in sloop Norfolk; he surveys Moreton Bay between the 15th and 31st and charts Hervey Bay on 2 August. He returns to Sydney on 20 August.
 * 18 October – Five settlers are found guilty of killing aborigines in the Hawkesbury, they are later pardoned.
 * 5 November – Hunter is recalled and Philip Gidley King is named as his successor
 * 28 December – The gaol in Parramatta is lost to arson.

Births

 * 25 August – John Dunmore Lang
 * 2 October – William Lonsdale
 * 15 October – Archibald Mosman

Deaths

 * 26 January – Thomas Muir