Genyodectes, meaning “jaw biter”, is a genus of theropod dinosaur from the Early Cretaceous Period (Aptian stage) of South America. It was collected from the CaÃ±adÃ³n Grande, Departamento Paso de Indios in the Chubut Province of Argentina. The remains consisted of an incomplete snout, portions of the jawbone, teeth, and a few other skull bones. These remains were poorly preserved, but were articulated as a new genus.
The type species, G. serus, is the only known of the genus. It was first described in 1901 by Sir Arthur S. Woodward as the second non-avian dinosaur to be found in South America. It was the most complete South American theropod until the 1970s.