| Named By: | Florentino Ameghino in 1887 |
| Time Period: | Early Miocene (Santacrucian)~17.5-15.5 Ma [1] |
| Location: | South America |
| Size: | Up to 1.5 meters long |
| Diet: | Carnivore |
| Fossil(s): | Many specimens |
| Classification: | | Chordata | Mammalia | Metatheria | Sparassodonta | Borhyaenidae | |
| Also known as: | | Acrocyon patagonensis | Arctodictis australis | Borhyaena excavata | Borhyaena sanguinaria | Borhyaena zitteli | Conodonictis | Dinamyctis | Dynamictis | Pseudoborhyaena | |
Borhyaena is an extinct genus of South American metatherian, living between 17.5 and 15.5 million years ago in Patagonia, Argentina (Santa Cruz and Sarmiento Formations) and Chile (Rio Frias Formation). Borhyaena was a predator and had a large head and a long, powerful neck similar to living hyenas, its legs were cursorial, albeit less specialized than those of wolves or the marsupial thylacine. The most complete specimen is estimated to have weighted 23 kilograms (51 lb) and stood 50 centimetres (1.6 ft) at the shoulders.