| Named By: | E. C. Olsen in 1937 |
| Time Period: | Late Permian |
| Location: | South Africa |
| Size: | Depending upon species, between 60 and 110 centimetres in length |
| Diet: | Carnivore |
| Fossil(s): | Skulls |
| Classification: | | Chordata | Synapsida | Therapsida | Theriodontia | Gorgonopsia | |
| Also known as: | | Cyniscops | Cyniscopoides | Galerhynchus kitchingi | Tangagorgon | |
Cyonosaurus is a genus of gorgonopsian therapsid from the Late Permian of South Africa. Cyonosaurus was 0.6 to 1.1 metres (2 ft 0 in to 3 ft 7 in) in length, with a skull 9 to 18 centimetres (3 1/2 to 7 in) in length. The type species Cyonosaurus longiceps was named in 1937.