How do you say in the french language are Australian?

There are a few ways to say "I am Australian" in French, depending on the level of formality and nuance you want to convey:

Formal:

* Je suis australien/australienne. (This is the most direct and literal translation.)

Informal:

* Je suis Australien/Australienne. (This is a more casual way to say it, often used among friends.)

* Je suis d'Australie. (This means "I am from Australia" and is a slightly more nuanced way to express nationality.)

Note:

* Australien is used for male and Australienne for female.

* The definite article "le" is not used before "Australie" when referring to the nationality.

You can also use the phrase "Je suis originaire d'Australie" which translates to "I am originally from Australia." This emphasizes that you were born and/or raised in Australia, even if you are currently living elsewhere.