Portal:Australia/Anniversaries/June/June 20
- 1790 – The Second Fleet arrives at Port Jackson.
- 1866 – Adelaide's Town Hall opens.
- 1927 – Film premiere of For the Term of his Natural Life.
- 1949 – Lance Sharkey, chairman of the Communist Party, is convicted for sedition.
- 1999 – Australia wins the 1999 Cricket World Cup, defeating Pakistan in the final.
- 2002 – Australia decided to ratify the International Criminal Court.