Luiz Fux (Portuguese pronunciation: [luˈis ˈfuks]; born 26 April 1953) is a Brazilian judge and the former Chief Justice of the Supreme Federal Court.

[3] In March 2005, Fux was admitted by President Luiz Inácio Lula da Silva to the Order of Military Merit in the degree of Special Commander.

On 23 March 2011, Fux gave the decisive vote rendering the Lei da Ficha Limpa unconstitutional in its applicability to the 2010 Brazilian general election.

[5] In an interview with Folha de S.Paulo on 2 December 2012, Fux revealed details of the lobbying effort that preceded his nomination to the Supreme Court by President Dilma Rousseff.

Among his requests for political support, he included José Dirceu, Chief of Staff of President Lula, still an influential figure in the ruling Workers Party (PT), even after being accused in the Mensalão scandal.