Australia may refer to:
- Australia (nation), the current nation with the name 'Australia'.
- Austria, European nation with similar name to 'Australia'.
- Oceanian Empire, former nation based in Oceania.
- United Australia, alliance on the main Australia island and Tasmania.
- Union of Oceanian States, union of most nations in Oceania.
- Australia (continent), the continent focused around the islands of Australia.
- Oceania (continent), continent including New Zealand, islands of Australia and others.
- Zealandia, fallen continent focused around New Zealand.
- Category:Australia, category for pages associated with the continent of Australia.
- Category:Oceania, category for pages associated with the continent of Oceania.
- Category:Zealandia, category for pages assosciated with the fallen continent of Zealandia.