Australia: Heads of State: 1901-2026
All Heads of State in the following index are also Heads of State in the United Kingdom of Great Britain and Northern Ireland, and other realms and territories.
| 1 Jan 1901 - 29 May 1953 | sovereigns of the United Kingdom |
| By the Grace of God, of the United Kingdom, Australia and Her other Realms and Territories Queen, Head of the Commonwealth, Defender of the Faith | |
| 29 May 1953 - 19 Oct 1973 | Elizabeth II |
| By the Grace of God Queen of Australia and Her other Realms and Territories, Head of the Commonwealth | |
| 19 Oct 1973 - 8 Sep 2022 | Elizabeth II |
| By the Grace of God, King of Australia and His other Realms and Territories, Head of the Commonwealth | |
| 8 Sep 2022 - | Charles III |