Hemihegetotherium is an extinct genus of hegetotheriid notoungulate that lived from the Middle to the Late Miocene of what is now Argentina.

Like some of its relatives, the first pair of incisors of Hemihegetotherium was large, and it had simplified but high-crowned (hypsodont) molars and premolars.

The structure of those teeth were so simplified in Hemihegetotherium that they consisted of simply a curved cylinder of enamel filled with dentin ; compared to Hegetotherium, the molars were more convex, with a semi-elliptical section.

Hemihegetotherium was a member of Hegetotheriidae (hence its generic name, meaning "half Hegetotherium"), a group of usually small notoungulates with the superficial appearance of rodents or hares.

Hemihegetotherium was a terrestrial herbivore, probably consumming low and particularly fibrous plants, both in open and forested areas.