急! 我身在澳洲, 香港護照快過期, 12月才回港能出境嗎

The answer is yes - airlines can deny boarding as you don't have a valid travel document, even you are returning to the place of issuance of that document.

You will need to go to your nearest Chinese Consulate to get a new passport (or travel document if urgent) if you are using HKSAR Passport.

If you are using BN(O) Passport, check with your local High Commission for extension purpose (it is a mess to get a new British Passport, so if you can, get an extension instead).



2014-09-03 20:36:38 補充：
Simple - a single question will resolve your concern:

If you are asked to pick an answer from here, which one has a higher risk if the answer turn out to be incorrect?

去澳洲中國領事館申請代换領香港特區護照，換領費用再加郵遞費，你要預番時間(即香港換領時間另加郵遞來回)。
通常你持原居地過期護照，航空公司都會俾你check in，你到香港就用HKIC入境。

2014-09-01 09:03:51 補充：
因為你原居地護照過期而要返回原居地，佢地都唔想留你喺度，否則到你當地visa又到期，分分鐘成為黑市居民，望你快D走人。