Ekrixinatosaurus ('explosion-born reptile') is a genus of theropod dinosaur which lived during the Late Cretaceous. Its fossils have been found in Argentina. The type species, Ekrixinatosaurus novasi, was first described in 2004 by Argentinian paleontologist Jorge Calvo, and Chilean paleontologists David Rubilar-Rogers and Karen Moreno. It was discovered in the Candeleros Formation, a geologic formation that outcrops in Río Negro, Neuquén, and Mendoza provinces of Argentina. The formation dates from 100-97 mya.