| Named By: | Elmer S. Riggs in 1933 |
| Time Period: | Late Miocene-Piacenzian~9-3 Ma |
| Location: | South America, Especially Argentina |
| Size: | 1.2 meters long |
| Diet: | Carnivore |
| Fossil(s): | Several remains, although a complete specimen still proves elusive |
| Classification: | | Chordata | Mammalia | Sparassodonta | Thylacosmilidae | |
Thylacosmilus is an extinct genus of saber-toothed metatherian that inhabited South America from the Late Miocene to Piacenzian epochs. Remains of this animal have been found primarily in Catamarca, Entre Rios, and La Pampa Provinces in northern Argentina.