| Named By: | Samuel Paul Welles in 1984 |
| Time Period: | Late Triassic, 228-201 Ma |
| Location: | Germany - Trossingen Formation |
| Size: | 5.15 meters long |
| Diet: | Carnivore |
| Fossil(s): | Partial skull and post cranial remains of at least two individuals |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Theropoda | Coelophysoidea | |
| Also known as: | | Halticosaurus liliensterni | |
Liliensternus is an extinct genus of basal Neotheropod dinosaur that lived approximately 210 million years ago during the latter part of the Triassic Period in what is now Germany. Liliensternus was a moderate-sized, bipedal, ground-dwelling carnivore, that could grow up to 5.15 m (16.9 ft) long. It is the best represented Triassic theropod from Europe and one of the largest known.