Portal:Australia/Anniversaries/April/April 5
- 1932 – Racehorse Phar Lap is found dead.
- 1933 – Anthropologist and protector of Aborigines Walter Edmund Roth dies.
- 2004 – Australia's biggest supplier to the farming community of the potential explosive ammonium nitrate decides to pull the product from its stores in response to concerns it could be used by terrorists.