无齿兽属（学名：Oudenodon）是已灭绝合弓纲的一属，属于异齿亚目的二齿兽下目，化石发现于非洲南部，生存年代为二叠纪晚期。无齿兽目前已有数个已命名种。模式种O. grandis以及O. bainii的化石发现于南非。O. luangwensis的化石发现于赞比亚。O. sakamenensis的化石发现于马达加斯加，是已知唯一发现于马达加斯加的兽孔目。

无齿兽是无齿兽科的模式属，无齿兽科还包含：Cteniosaurus、Tropidostoma、以及Rhachiocephalus。

Oudenodon is an extinct genus of dicynodont. It was common throughout southern Africa during the Late Permian. Several species of Oudenodon are known. Both O. bainii, the type species, and O. grandis are known from South Africa. Specimens of O. luangwensis have been found from Zambia. One species, O. sakamenensis, is the only therapsid yet known from Madagascar. It is the type genus of the family Oudenodontidae, which includes members such as Cteniosaurus, Tropidostoma, and Rhachiocephalus.