Fierro is an Argentinian animated film released on November 8, 2007. It was directed by Liliana Romero and Norman Ruiz. Its script is an original work of Horacio Grinberg and Roberto Fontanarrosa and is based in the poem Martín Fierro, written by José Hernández between 1872 and 1879. The characters designs are also original Fontanarrosa's work.