I am Brazilian married to an American, what do I need to register my marriage in Brasl?

http://novayork.itamaraty.gov.br/pt-br/casamento.xml

I will ask you the same question that you asked me when I wanted to register mine. Is there a need for that? Yes there is, you have to translate your marriage certificate at the consulate, and when you arrive in Brazil. You will have to look for a Sworn translator to take it to your city's registry office for registration. But make sure with the consulate calling there or entering the consulate's page. Here at Google nobody works for the consulate.