There are four pathways to obtaining Australian citizenship.
If one parent of the applicant is an Australian citizen or permanent resident, the child born in Australia is an automatic citizen of Australia.
You may be eligible to become an Australian citizen by descent if you were born outside Australia on or after 26 January 1949 and if one of your parents was an Australian citizen at the time of your birth.
You may be eligible to become an Australian citizen by conferral if you are a permanent resident and have resided in Australia for a required period of time and meet all other criteria.
Generally, the residence requirements for Australian citizenship by conferral are:
This option is available to former Australian citizens who renounced their Australian citizenship and wish to apply for Australian citizenship again provided they become eligible to do so.