Do Australia passport holders need a visa to visit GW?

Yes, Australian passport holders need a visa for Guinea-Bissau. The recommended route is the official biometric eVisa applied for online before travel; a visa on arrival is also available but less reliable. Proof of yellow fever vaccination is mandatory. Australia is not on Guinea-Bissau's visa-exempt list (which covers only ECOWAS member states and certain CPLP diplomatic/service passport holders), so an ordinary Australian passport holder requires a visa for a short tourist visit. Guinea-Bissau operates an official Electronic Visa Application System at rgb-visa.com, which issues a biometric single-entry visa for stays of up to 90 days; frequent travellers can request a multiple-entry visa. The eVisa is the recommended channel because it lets you arrive with an approval already issued, avoiding queues and the unpredictable authorization-letter requirement of visa on arrival. A visa on arrival is theoretically available to non-exempt nationals at Osvaldo Vieira International Airport in Bissau, but it can require a pre-arranged authorization letter from the Migration Office and is widely reported as unreliable, so applying in advance is strongly advised. Entry also requires a passport valid at least six months beyond the intended stay, proof of onward/return travel, and a valid yellow fever vaccination certificate, which is mandatory for entry. Australia has no embassy or consulate in Guinea-Bissau; consular support is handled via the Australian Embassy in Lisbon, Portugal. Travellers should also note that DFAT (Smartraveller) maintains an elevated travel advisory for Guinea-Bissau due to political instability and crime, so the latest advice should be checked before booking.