Nicolás Mario Domingo (born 8 April 1985) is an Argentine football midfielder who plays for Arsenal de Sarandí.

Domingo embarked on his playing career in 2005, making his league debut in a 2–1 home defeat to Gimnasia y Esgrima de La Plata.

In 2008, he was loaned to Italian club Genoa but did not make an appearance for the first team.

River Plate had been recently relegated for the first time in their history.

This biographical article related to an Argentine association football midfielder born in the 1980s is a stub.