Marcelo Gustavo Milanesio (born February 11, 1965, in Hernando, Córdoba) is an Argentine former professional basketball player.

He and his brother Mario joined club Atenas in 1982 and debuted in the senior squad on June 2, in a match of local league "Torneo León Zakalian" organised by the Argentine Basketball Association.

The first official game for Atenas came on August 9, when they beat Club Argentino of Villa Cabrera 108–51, with Milanesio scoring 16 points.

It was in 1984 that the then-National League transitioned to the "Liga Nacional de Básquetbol", when Atenas lost the semifinals to River Plate, being eliminated.

In 2004, he organised his first National Campus at Villa Carlos Paz, which has since successfully repeated every year, and receive around 150 children and teenagers from Argentina, and from neighbouring Bolivia and Chile.

In August 2010, Milanesio was designated as assistant coach to and helper of Sergio Hernández to the Argentina national basketball team, preparing for the 2010 FIBA World Championship, in Turkey.