Marcos Valério Fernandes de Souza (born January 29, 1961) is a Brazilian businessman in the field of public relations.

His professional career began in the state bank of Minas Gerais [pt], known as Bemge (bought by Banco Itaú, in 1998).

He entered the business of public relations in 1996 with a partnership with Clésio Andrade, Cristiano Paz and Ramon Cardoso with the public relations and advertising firm SMP&B [pt].

He was one of the main accused in the Mensalão scandal and found guilty of bribery, embezzlement, money laundering, tax evasion and conspiracy.

In October 2012 he was given a sentence of 40 years 2 months and 10 days imprisonment and a fine of R$2.72 million.