The following lists events that happened during 1805 in Australia.

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← 1804 1803 1802 1805 in Australia → 1806 1807 1808
Decades:	1780s 1790s 1800s 1810s 1820s
See also:	Other events of 1805 Timeline of Australian history

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• Monarch - George III

• 24 May – William Bligh is appointed the fourth Governor of New South Wales for the salary of £2000 per year and £1000 pension. He arrives at Port Jackson to replace King on 6 August 1806.^[1]
• 8 June – John Macarthur returned to New South Wales as a civilian settler; the British Government accepted his resignation from the New South Wales Corps and approved his return.

• 15 February – Governor King instructed (apparently reluctantly) a surveyor to measure 5,000 acres (20 km²) for John Macarthur at Cowpastures, where Macarthur had been promised land by the Secretary of State for War and the Colonies, Lord Camden. Macarthur named his property Camden Park in honour of his sponsor.