Oscar Isidro Parrilli (born 13 August 1951) is an Argentine lawyer and politician, member of the Justicialist Party.
He was born in San Martín de Los Andes, Neuquén province in 1951 and studied law at the University of Buenos Aires.
He obtained his law degree in 1976 from the University of Buenos Aires and specialized in Commercial Societies and business management at the Universidad del Comahue.
With the return to democracy, he was elected congressman in the Legislature of the province of Neuquén in the period 1983-1987, he presided over the Justicialist bloc between 1986 and 1987.
He was a candidate for the governorship of his province in 1991 and obtained 30% of the votes, behind the elected governor Jorge Sobisch.