Marina Raquel Riofrío (born 30 May 1958) is an Argentine Justicialist Party politician.

She was a member of the Argentine Senate representing San Juan Province in the majority block of the Front for Victory from 2005 to 2017.

Following several years as a member of the permanent body of lawyers at the Office of the Public Prosecutor of San Juan, in 1996 she became Director of the Legal and Technical Directorate of the Province.

In 1999, Riofrío was elected as a councillor to the San Juan city council, serving until 2003 when she returned to the provincial government as Subsecretary of Development and Family Promotion.

She is a member of the Argentine delegation to the Latin American Parliament.