Portal:Australia/Anniversaries/June/June 21
- 1845 – News of the discovery of a rich body of copper ore at Burra, South Australia is published in Adelaide newspapers.
- 1913 – HMAS Australia is commissioned at Portsmouth as flagship of the Royal Australian Navy.
- 1933 – Maude Bonney becomes the first woman to fly from Australia to England.
- 1954 – John Landy is the second man in the world to run a mile in under 4 minutes, setting a world record time of 3 mins 58 secs at Turku, Finland.