| Named By: | Teresa Maryanska in 1977 |
| Time Period: | Late Cretaceous, 75-70 Ma |
| Location: | Mongolia, Nemegt Basin - Barun Goyot Formation |
| Size: | Estimated between 8 and 8.5 meters long. Skull 40 centimetres long, 45 centimetres wide |
| Diet: | Herbivore |
| Fossil(s): | Multiple specimens and further referred fossils, together revealing the skull and post cranial skeleton |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Thyreophoroidea | Ankylosauridae | Ankylosaurinae | |
| Also known as: | | Dyoplosaurus giganteus | Tarchia kielanae | |
Tarchia (meaning "brainy one") is a genus of herbivorous ankylosaurid dinosaur from the late Cretaceous of Mongolia.