Este artigo apresenta uma discussao sobre a variacao linguistica, mostrando as tres normas que coexistem no portugues do Brasil: norma-padrao, normas cultas e normas populares. Faz uma breve analise do conceito de norma, surgido no seio do Estruturalismo, a partir de trabalhos de Eugenio Coseriu (1980), antes de evidenciar a visao de diferentes pesquisadores da area da Sociolinguistica sobre essa tematica, a saber Bagno (2001; 2003; 2009), Faraco (2002; 2008), Lucchesi (2001; 2002) e Bortoni-Ricardo (2009). ABSTRACT: This article presents a discussion about linguistic variation, showing the three norms that coexist in brasilian portuguese: standard norm, cultured norm and popular norms. Give a brief review of the concept of norm, emerged in the framework of Structuralism from the works of Eugenio Coseriu (1980), before evidencing the vision of different researchers in the area of Sociolinguistic on this subject, named Bagno (2001; 2003; 2009), Faraco (2002; 2008), Lucchesi (2001; 2002) e Bortoni-Ricardo (2009). KEYWORDS: Linguistic variation, linguistic norms, standard norm.