Every Passenger requires a valid Passport to travel Internationally.

Do I need six months validity left on my passport before I can travel from and then re enter Australia? 

Australian passports are valid for travel into and out of Australia regardless of the length of remaining validity. An Australian passport remains valid until the expiry date. However, it is the right of any country to control entry into their borders and this is usually done via visas or ensuring sufficient validity remains on the visitor’s travel document. Entry requirements are decided by foreign governments and are not something that the Australian Government can influence. You need to ensure that your passport has adequate validity to meet the entry requirements of the countries you intend to visit (or transit). Some countries require travellers to have at least six months validity remaining on their passports beyond the period of intended stay, and immigration authorities may refuse entry if you arrive with less than this. Airlines and passenger shipping lines may refuse to carry you if your passport has inadequate validity.

Before travel you should contact the Embassy, High Commission or Consular representative of all the countries you will be travelling to, or seek advice from your travel agent, to identify each country’s passport validity requirements. If you are unsure, it is safest to renew your passport prior to travelling.

For more information about passports, click on the link below to go to the passport office website.https://www.passports.gov.au/Web/index.aspx

Visas

A visa is a form of permission for a non-citizen to enter, transit or remain in a particular country.

1. A visa does not guarantee entry, that decision remains the right of the immigration officials of the country concerned.

2. The immigration laws of most countries do not have provision for appeal. Some countries ask visitors to present return tickets and evidence of funds sufficient to cover the intended stay. Others have compulsory currency exchange regulations on entry.

3. Some refuse entry to visitors who do not comply with requirements.

4. Visas for visitors to Australia Information on visas to Australia can be found at the Department of Immigration and Citizenship. Visas for Australians travelling overseas Only the countries you plan to visit can provide up-to-date information about their visa requirements. For all countries, We can provide information or you may contact the nearest embassy or consulate of the country you intend to visit well in advance of travel. 

Additional advice can be found on the Smartraveller website: http://www.smartraveller.gov.au