Portal:Australia/Anniversaries/September/September 27
- 1932 – Maude Bonney becomes first woman to fly around Australia.
- 1949 – Graham Richardson, former Labor politician and "numbers man" in New South Wales was born in Sydney.
- 1956 – The British nuclear tests at Maralinga begin with Operation Buffalo.
- 1975 – Jack Lang, Australian politician and Premier of New South Wales, died in Auburn, aged 98.