Marcelo is a given name, the Spanish and Portuguese form of Marcellus. The Italian version of the name is Marcello, differing in having an additional "l". Marcelo may refer to:
Marcelo Arriagada, Chilean road cyclist
Marcelo Caetano
Marcelo Rebelo de Sousa
Marcelo Cassaro
Marcelo Dias, bass guitarist for American alternative rock band Against All Will
Marcelo Del Debbio
Marcelo Djian
Marcelo Fromer
Marcelo Garraffo
Marcelo Negrão
Marcelo José da Silva, known as Marcelo Silva - Brazilian former footballer
Marcelo Vieira, Brazilian footballer, who plays for Real Madrid
Marcelo Antônio Guedes Filho, Brazilian footballer, who plays for Beşiktaş J.K.