Records of cetaceans from the Late Miocene from Entre Rios, Argentina. In this paper cetacean remains from the Paraná Formation (Late Miocene) of the Entre Ríos province, Argentina are described. The following groups are described in detail from the Paraná Formation: Balaenidae, Balaenopteridae (Mysticeti), Platanistoidea and Physeteridae (Odontoceti). The Balaenopteridae record represents the ancient for the family in Argentina.