The Brazilian Association of Atheists and Agnostics (Portuguese: Associação Brasileira de Ateus e Agnósticos), or ATEA, is a Brazilian atheist activist nonprofit organization founded in August 2008.

The organization advocates the separation of church and state and promotes atheism and agnosticism.

[1] Although Brazil is legally defined by its Constitution as a secular state, the organization has voiced its concern that this is not observed in practice.

Its slogans have been: "Religião não define caráter" ("Religion does not define character"), "A fé não dá respostas, só evita perguntas."

It only prevents questions"), "Se Deus existe, tudo é permitido" ("If God exists, everything is permitted") and "Somos todos ateus para os deuses dos outros" ("We are all atheists to others' gods").