Brandtocetus is a genus of cetotheriid mysticete in the subfamily Cetotheriinae. The type and only species is Brandtocetus chongulek from the late Miocene (Tortonian) of the Kerch Peninsula in Crimea. Brandtocetus chongulek was a whale approximately 4–5 m long differing from all Cetotheriidae by having a transversely expanded lateral portion of the squamosal bone ; a rhomboid temporal fossa; an occipital shield extending anterior to the center of the temporal fossa; and an elongated posterior process of the tympanoperiotic with a proximodistally extended, and distally expanded, distal portion exposed as an oval surface on the posterolateral skull wall.