Non-Australian citizens from certain countries are eligible to transit through Australia without a visa.
The following categories of travellers are covered under this arrangement:
Citizens of the these countries: Andorra, Argentina, Austria, Belgium,
Brunei, Canada, Cyprus, Czech Republic, Denmark, Estonia, Federated
States of Micronesia, Fiji, Finland, France, Germany, Greece, Hungary,
Iceland, Indonesia, Ireland, Italy, Japan, Kiribati, Latvia,
Liechtenstein, Lithuania, Luxembourg, Malaysia, Malta, Mexico, Monaco,
Nauru, Netherlands, New Zealand, Norway, Oman, Palau, Papua New
Guinea, Philippines, Poland, Portugal, Republic of South Africa,
Republic of Marshall Islands, Samoa, San Marino, Singapore, Slovakia,
Slovenia, Solomon Islands, South Korea, Spain, Sweden, Switzerland,
Thailand, Tonga, Tuvalu, the United Arab Emirates, United Kingdom,
U.S.A., Vanuatu and Vatican City.