| Named By: | Robert broom in 1936 |
| Time Period: | Middle Permian- Early Triassic, 261-247 Ma |
| Location: | South Africa |
| Size: | Unavailable |
| Diet: | Unavailable |
| Fossil(s): | Skull and jaw |
| Classification: | | Chordata | Synapsida | Therapsida | Cynodontia | Thrinaxodontidae | |
Thrinaxodontidae is an extinct family of cynodonts that includes the genera Thrinaxodon, Nanictosaurus, Nanocynodon, and Novocynodon, and possibly Bolotridon and Platycraniellus. All thrinaxodontids share a bony secondary palate. Thrinaxodontids are basal members of the cynodont clade Epicynodontia. Some studies consider the family a paraphyletic group, representing an evolutionary grade of basal epicynodonts rather than an actual clade.