Ashoroa (named after its type locality Ashoro, Hokkaido) is an extinct genus of desmostylian, aquatic, herbivorous mammal.

Fossils of Ashoroa have been found in the Morawan Formation on Hokkaido, Japan (43°18′N 143°48′E / 43.3°N 143.8°E / 43.3; 143.8, paleocoordinates 44°36′N 141°24′E / 44.6°N 141.4°E / 44.6; 141.4) and were dated to the late Oligocene.

It is known from a rib, a humerus, a femur, and three vertebrae of the single species and holotype, Ashoroa laticosta.

The recovered long bones lack inner cavities, like in Paleoparadoxia and Desmostylus, and the trabecular pattern is different from that in Behemotops.

as a "shallow water swimmer, either hovering slowly at a preferred depth, or walking on the bottom".