Portal:Australia/Anniversaries/May/May 11
- 1938 – Two jockeys are killed in a racing incident at Morphettville Racecourse.
- 1982 – The High Court upholds the Racial Discrimination Act 1975 in Koowarta v Bjelke-Petersen.
- 1989 – Rosemary Follett became the first Chief Minister of the Australian Capital Territory and the first female leader of any Australian state or territory.