Adelobasileus is a genus of mammaliamorph cynodonts from the Late Triassic (Carnian to Rhaetian), about 225 - 220 million years ago.

Adelobasileus predates and descends from the non-mammalian cynodonts Tritylodontidae and Tritheledontidae by 10 million years.

Distinct cranial features, especially the housing of the cochlea, suggest that Adelobasileus is a transitional form in the character transformation from non-mammaliaform cynodonts to mammaliaforms.

For this reason, it is thought to be a close relative of the common ancestor of all modern mammals.

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