Portal:Australia/Anniversaries/September/September 21

• 1965 – Australian actor David Wenham is born in Marrickville, New South Wales.
• 1973 – The Jackson Pollock painting Blue Poles is controversially purchased by the Whitlam government for A$1.3 million.
• 1971 – The 4th Battalion, Royal Australian Regiment is involved in Australia's last major action of the Vietnam War at Nui Dat.
• 2000 – French athlete Marie-José Pérec flees the Olympic village without competing in the 2000 Summer Olympics in Sydney.