| Named By: | M. Huh, D.inG. Lee, J.inK. Kim, J.inD. Lim & P. Godefroit in 2011 |
| Time Period: | Late Cretaceous, Santonian-Campanian |
| Location: | South Korea - Seonso Conglomerate Formation |
| Size: | Roughly about 1.8-2 meters long |
| Diet: | Herbivore |
| Fossil(s): | Partial post cranial skeleton |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | |
Koreanosaurus (meaning "Korean lizard") is a genus of ornithopod dinosaur. In May 2003 three fossils of Koreanosaurus were found in the Late Cretaceous-age Seonso Conglomerate from the southern coast of the Bi-bong Dinosaur Fossil Findspot, Boseong, Korean Peninsula: the holotype KDRC-BB2, a partial skeleton lacking the skull, and the paratypes KDRC-BB1 and KDRC-BB3. The type species is Koreanosaurus boseongensis, after its discovery locality (Boseong site 5). The type species was initially named and described in a master's thesis by Lee Dae-Gil in 2008, and was officially published by Min Huh, Dae-Gil Lee, Jung-Kyun Kim, Jong-Deock Lim and Pascal Godefroit in 2011.
Koreanosaurus was considered to be a basal member of the Ornithopoda by the authors, forming a clade with Zephyrosaurus schaffi, Orodromeus makelai and Oryctodromeus cubicularis from which they deduced a burrowing lifestyle. Han et al. found it plausible that Koreanosaurus might be a member of Jeholosauridae or closely related to it.