If you're an American citizen traveling to Portugal, you do not need a visa if you plan on staying for less than 90 days. But your passport must be valid for at least six months beyond your stay.
If you're an Australian citizen visiting Portugal or any other party to the Schengen Agreement, you don't need a visa if you stay for less than 90 days. Your passport must have at least six-month validity from the planned return date.
EU, EEA, and Swiss Citizens
As citizens of the European Union and European Economic Area, you'll not need a visa to enter Portugal:
EU member countries
Germany, Austria, Belgium, Bulgaria, Cyprus, Croatia, Denmark, Slovakia, Slovenia, Spain, Estonia, Finland, France, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Czech Republic, Romania, and Sweden.
Iceland, Liechtenstein, and Norway.
Citizens of the following countries do not need a visa to enter Portugal
The following countries do not require a visa for visits lasting less than 90 days, but require a valid passport to enter Portugal:
Andorra, Antigua and Bermuda, Argentina, Bahamas, Barbados, Bolivia, Bosnia, Brunei, Canada, Chile, Costa Rica, El Salvador, Guatemala, Honduras, Hong Kong, Israel, Japan, Korea, Macao, Malaysia, Mauritius, Mexico, Monaco, Montenegro, Nicaragua, New Zealand, Panama, Paraguay, Saint Kitts and Nevis, San Marino, Serbia, Seychelles, Singapour, Taiwan, Uruguay, and Venezuela.
For citizens of countries not previously mentioned, we recommend visiting the Embassy of Portugal in your country or checking Portugal's Schengen Visa Application Requirements: