You are eligible for visa free entry
Each visit can be as long as 90 days. If you have multiple entries within a given period, there is no strict rolling cap on total days, as long as each individual stay does not exceed the 90 days stamped on arrival.
You must have a valid Australian ordinary passport. There is no formal minimum validity requirement other than your planned stay but it is strongly advised to travel with a passport with at least six months validity remaining.
The visa-free agreement allows for tourism, business meetings, visits to family or friends, cultural activities, and transit. It does not include those who plan to take up employment (paid or unpaid) or to enter into formal study.
The visa-free arrangement applies to all ports of entry open to foreign nationals in Hong Kong, including international airports, sea terminals and land border crossings with Mainland China.
You don't need to apply for a visa in advance, but when you arrive immigration officers may ask you for:
Visitors from abroad will need to complete a landing declaration. This is usually given out on the aircraft or is available at the port of entry on arrival.
Usually you’ll need to show a confirmed return or onward ticket at the border showing that you intend to leave Hong Kong before your permitted stay expires.
either hotel bookings covering the period of your stay or an invitation letter from a host in Hong Kong if you are staying with a private contact.
Not always a formal requirement but immigration officers may require you to prove that you have the means to support yourself financially during your visit without having to work.
The visa-free entry does not permit employment of any kind, paid or voluntary, nor entry as a student. These purposes require a separate work visa or student entry permit obtained before travel from the relevant Chinese mission.
Overstaying
There is no formal restriction on the number of times you may enter Hong Kong, provided each individual visit stays within the 90-day allowance and your purpose remains within permitted activities.
Hong Kong and Mainland China operate under entirely separate immigration systems. Your visa-free access to Hong Kong does not grant you entry to Mainland China. Australian citizens wishing to visit Mainland China must obtain a separate visa - or qualify under China's own visa-free arrangements - before crossing the border.
Check if you need a visa for your next destination