Portal:Australia/Anniversaries/August/August 20
- 1857 – The Dunbar is wrecked at the entrance to Sydney Harbour, killing 121 pessangers.
- 1860 – Burke and Wills expedition sets off from Royal Park, Melbourne at about 4 pm watched by around 15,000 spectators.
- 1908 – The United States Great White Fleet arrives in Sydney.
- 2003 – Politicians Pauline Hanson and David Ettridge are sentenced to three years in prison after being found guilty of electoral fraud in Queensland, the charges are later overturned.