Do Australia passport holders need a visa to visit BI?

Yes, Australian passport holders need a visa for Burundi. The recommended option is the eVisa applied for online before travel via the official migration.gov.bi portal; a visa on arrival is also available at Bujumbura International Airport. A yellow fever vaccination certificate is required. Australia is not on Burundi's visa-exemption list, so an ordinary Australian passport holder needs a visa for a short tourist visit. Burundi's General Commissariat for Migration (Commissariat Général des Migrations) operates an official online eVisa system at migration.gov.bi. The single-entry tourist eVisa costs USD 40 (short stay) and the multiple-entry visa USD 90 for a 1-month stay (renewable up to twice, up to a maximum stay of 90 days); fees are payable in USD or EUR. Processing is typically around 3 working days. A visa on arrival is also available at Melchior Ndadaye International Airport in Bujumbura (USD 40 for a 72-hour visa up to USD 90 for 30 days), but obtaining the eVisa in advance is recommended to avoid uncertainty at the border. A valid yellow fever vaccination certificate is required for entry, and the passport should be valid for at least six months. Burundi is not in the Schengen area, so the Schengen 90/180 rule and ETIAS do not apply.