Mariano Gustavo Soso (born 30 April 1981) is an Argentine football manager, currently in charge of Newell's Old Boys.

Born in Rosario, Santa Fe, Soso started his career in Newell's Old Boys' youth categories.

In 2009, he became Claudio Vivas' assistant at Argentinos Juniors for six months, before joining Javier Torrente's staff at Libertad, Cerro Porteño, Newell's and Nacional, under the same role.

[1] In 2013, after one season as Hernán Lisi's assistant at Unión Temuco, Soso rejoined Vivas' staff at Sporting Cristal.

[21] Soso was sacked by Sport on 25 July 2024,[22] after having only one win in the last six matches, and returned to Peru on 6 August after being named Alianza Lima manager.