eguchii (type)Barnes et al. 1995 Ashorocetus is a monotypic genus of an extinct primitive baleen whale of the family Aetiocetidae.

Fossils of this whale are found from the Chattian Morawan formation, near Ashoro, of upper Oligocene (28.4 to 23.03 million years ago) 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).

[1][2] Ashorocetus eguchii was described based on a partial skull and is named after the type locality and Kenichiro Eguchi of the Ashoro Museum of Paleontology.

It has a neatly telescoped skull and is closely related to Chonecetus, another primitive aetiocetid.

[4] The placement of A. polydentatus in Aetiocetus has, however, been questioned, as has the monophyly (and therefore the proposed subfamilies) of Aetiocetidae.