Marcelo Vieira da Silva Júnior, more commonly known as Marcelo or Marcelo Vieira, born May 12, 1988 in Rio de Janeiro, Brazil, is a Brazilian footballer playing at the back left-back position.

After being revealed to Fluminense, he has played since 2007 at Real Madrid, with which he has won the Spanish championship in 2007, 2008, 2012 and 2017 and the Champions League in 2014, 2016 and 2017.
He has been selected since 2006 as a Brazilian team, with which he won the 2013 Confederations Cup and is competing in the 2014 World Cup.