| Named By: | Johann Jakob Kaup in 1829 |
| Time Period: | Middle Miocene-Early Pleistocene |
| Location: | Africa and Eurasia |
| Size: | Males usually up to 4.5 meters high at the shoulder, although some specimens hint at up to five meters high for the largest individuals. Males which are usually called bulls were larger than females which are called cows |
| Diet: | Herbivore |
| Fossil(s): | Multiple specimens |
| Classification: | | Chordata | Mammalia | Proboscidea | Deinotheroidea | Deinotheriidae | Deinotheriinae | |
Deinotherium ("terrible beast" derived from the Ancient Greek deinos, deinos meaning "terrible" and therion, therion meaning "beast") was a large prehistoric relative of modern-day elephants that appeared in the Middle Miocene and survived until the Early Pleistocene. During that time it changed very little. In life, it probably resembled modern elephants, except that its trunk was shorter, and it had downward curving tusks attached to the lower jaw.