Zygiocetus is an extinct genus of cetotheriid mysticete in the subfamily Cetotheriinae. The type and only species is Zygiocetus nartorum, known from the Late Miocene (Messinian) of Adygea in the Russian Caucasus.

Zygiocetus Temporal range: Miocene PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Infraorder:	Cetacea
Family:	Cetotheriidae
Genus:	†Zygiocetus Tarasenko, 2014
Species:	†Z. nartorum
Binomial name
†Zygiocetus nartorum Tarasenko, 2014

Zygiocetus nartorum is distinguished from other cetotheriines in having slightly arched lambdoid crests, and it is distinct from Cetotherium and Kurdalagonus in having a wide supraoccipital that is shaped like an extended isosceles triangle with arched lateral sides.^[1]