Júlio César Martins (born 4 January 1978 in Londrina, Brazil) is a Brazilian footballer.
He currently plays as a goalkeeper for Red Bull Brasil.
Júlio César has played for Santo André at Copa do Brasil 2004, played 3 matches, behind first choice Júnior Costa.
But at 2005 Copa Libertadores, he played as first choice.
In December 2007 he signed a one-year contract with São Caetano, Santo André's club rival.
He was offered a one-year extension in December 2008.