All travellers require a visa to enter Brazil, except Nationals of EU countries (excluding Cyprus, Estonia, Latvia, Lithuania & Malta) for stays of up to 90 days.
All travellers must be in possession of onward or return tickets and sufficient funds to cover their stay & ensure they have a valid passport for 6 months from date of entry.
Transit passengers continuing to a 3rd country by the same or first connecting flight, provided holding onward documentation and not leaving the airport, do not need a visa.
Tourist Visa - cost varies according to nationality. It is usually approximately US$30-40.
Transit Visa - contact the consulate for details of cost.
Note - All non-Brazilian nationals under 18 years of age, when not accompanied by both parents, must have a birth certificate (an original or authenticated photocopy). This must be in English, French, Portuguese or Spanish, otherwise an official translation must be presented as well.
It is advisable to check this information with your relevant embassy prior to travel.
US citizens who do not wish to go through the trouble of dealing with the red tape themselves can count on the professional services of Travel Visa Pro to speed things up: Apply for Brazil Visa Online (service starts from $39). If you need to renew, add pages, change name, or just get a new US passport, you can Apply for a New US Passport here.