Portal:Australia/Anniversaries/April/April 12
- 1835 – The convict transport George III sinks in D'Entrecasteaux Channel, 139 male convicts drown.
- 1851 – Between 7 and 12 April, four ounces of gold were won at what would become the township of Ophir, New South Wales – the first payable gold to be won in New South Wales and in Australia.
- 1924 – The battlecruiser HMAS Australia is scuttled off Sydney Heads.
- 1961 – Actor and comedian Magda Szubanski is born.