Australia - Passport & Nationality - Australian Citizenship by Birth in Australia
If you were born in Australia between 26 January 1949 and 20 August 1986, then an application can be made for Citizenship. Once that is approved, an application for a passport can be made. A birth in Australia AFTER 20 August 1986 does not automatically result in Australian Citizenship, as the nationality and circumstances of your parents will dictate nationality.
Children born to foreign diplomats stationed in Australia do NOT acquire Australian Citizenship.