Juan Carlos Portantiero (Buenos Aires, 1934 – Buenos Aires, 9 March 2007) was an Argentine sociologist.
He specialized in the study of the works of Antonio Gramsci.
He graduated in Sociology in University of Buenos Aires, and went into exile during the last illegal military government (1976–1983) because of threats received.
He moved into Mexico, where he founded the Controversia journal.
After the return of democracy (1983), he became one of the most respected Argentine scholars and had a direct influence on politics as an advisor to Unión CÃvica Radical president Raúl AlfonsÃn and member of the advising team dubbed Grupo Esmeralda.
He acted as elected dean of UBA's Social Sciences School (1990–1998).