| Named By: | V. R. Alifanov & R. Barsbold in 2009 |
| Time Period: | Late Cretaceous |
| Location: | Mongolia - Barun Goyot Formation |
| Size: | Estimated 1.5 meters long |
| Diet: | Insectivore |
| Fossil(s): | Partial post cranial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Alvarezsauridae | |
Ceratonykus (meaning 'horned claw') is a genus of alvarezsaurid theropod dinosaur that existed in the late Cretaceous period. The discovery of a fragmented skeleton in Mongolia in early 2009 has led scientists to question where alvarezsaurids fit taxonomically into Theropoda.