who is this visa for?
This visa is for persons who are the Fiancee of an Australian Permanent Resident or Citizen, that wish to join their partner in Australia.
Prospective Marriage Visa

The Prospective Marriage visa (subclass 300) is for persons who want to come to Australia to marry their prospective spouse.
Prospective Marriage visa applicants must:
Once married, the visa holder may be eligible to make an application for a temporary (subclasses 820 or 309) Partner visa.
The Prospective Marriage visa is only for opposite sex couples. Same sex couples may be eligible to apply for a partner visa if they meet the requirements as a defacto couple.