Cantius frugivorus is a species of adapiform primate that lived in North America during the early Eocene.
This species had a dental formula of . The incisors are small and vertical in Cantius frugivorus, and the canines are prominent. The mandibular symphysis is unfused and this was most likely a diurnal species. Cantius frugivorus had an average body mass of around .
Based on the dental morphology of Cantius frugivorus, it most likely had a frugivorous diet.
The limb bones of Cantius frugivorus suggest it moved by arboreal quadrupedalism and leaping.