Nationals from some countries need neither a tourist visa nor a business visa to enter Brazil. The list of exempted countries may change without prior notice and it’s important to check with the Brazilian Embassy or Consulate whose jurisdiction you live in whether your country is really exempted. For those who need a visa, there is a special category for attendees of scientific meetings (VITUR), where a letter of invitation is needed. The organisation of the event will provide the required letters upon registration, in case you need them to apply for visas.
New Visa Rules for American, Australian, Canadian, and Japanese Travelers
Before the Summer Olympics in 2016, Brazil temporarily waived visa requirements for U.S. travelers to make it easier for them to get to the South American country. Resulting from that rise in tourism, Brazil then created an e-visa program in January 2018 that let U.S. citizens. Now, the Brazilian government has completely cancelled the visa requirement for American travelers. Starting June 17, 2019, citizens from Canada, Australia, Japan, and the U.S. can visit Brazil for up to 90 days without a visa.
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