| Named By: | Novas in 1996 |
| Time Period: | Late Cretaceous |
| Location: | Argentina, Neuquen Province - Neuquen Formation, Portezuelo Member |
| Size: | Estimates to be 2 meters long |
| Diet: | Insectivore |
| Fossil(s): | Partial post cranial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Coelurosauria | Maniraptoriformes | Alvarezsauroidea | Alvarezsauridae | Patagonykinae | |
Patagonykus is a genus of theropod dinosaur from the Upper Cretaceous of Argentina. This alvarezsaur was discovered in exposures of the Portezuelo Member (Turonian-Coniacian) of the Rio Neuquen Formation in the Neuquen Province of Argentina. The holotype consists of an incomplete but well-preserved skeleton, lacking a skull, but including many vertebrae, the coracoids, a partial forelimb, pelvic girdle, and hindlimbs. Patagonykus ("Patagonian claw") has been classed with the Alvarezsauridae, a family which includes such taxa as the Mongolian Mononykus and the Argentinian Alvarezsaurus. Patagonykus is estimated to have been approximately two meters in length.