Silvia Estela Sapag (born 22 February 1949) is an Argentine politician who has been a National Senator for Neuquén Province since 2019. A scion of the Sapag political family and a member of the Neuquén People's Movement, Sapag previously served as senator for Neuquén from 1998 to 2001, and as a National Deputy from 2008 to 2009. In the Senate, she sits in the Frente de Todos parliamentary bloc.