Originally Posted by
Nugget_Oz
As an Australian you must use your Australian passport to enter and leave the country (as you cannot be issued a visa as an Australian citizen). You're going to need your US passport to enter the US as well. One of the "burdens" of dual citizenship.
Strictly speaking I don't think they can deny you entry (you're an Australian citizen after all) but they can make it more trouble than it's worth. Direct quote from citizenship.gov.au:
> People trying to enter Australia as an Australian citizen but without an Australian passport face difficulties and delays
Given what the government considers "normal", I'd hate to see what they consider "difficulties and delays".