俄刻阿诺斯（古希腊语：Ὠκεανός）希腊神话中的一个泰坦，大洋河的河神。所谓大洋河是希腊人想象中环绕整个大地的巨大河流，代表世界上的全部海域。

在最原始的荷马史诗里，俄刻阿诺斯是原始神之一，与其妻忒堤斯一起为其他所有神的始祖。而后来被广为接受的赫西俄德的体系则把他划为由原始神产生的第二代神，为地母该亚与天神乌剌诺斯之子。按照赫西俄德，俄刻阿诺斯的妻子是他的妹妹忒堤斯，两人生下了3000个儿子和3000个女儿，这就是世界各地的河神与大洋神女（“俄刻阿尼得斯”）。

在提坦战争爆发时，俄刻阿诺斯明智地置身事外，因此在奥林波斯神推翻提坦的统治后仍得以保有自己的全部权利。奥林波斯神的首领宙斯的第一个妻子就是俄刻阿诺斯的女儿墨提斯（大洋神女之一）。埃斯库罗斯把俄刻阿诺斯描写成一个开明的人，他曾徒劳地试图使宙斯与普罗米修斯和解。在古典时代的希腊神话中，俄刻阿诺斯作为海洋主宰的地位被波塞冬取代。

Oceanus (/oʊˈsiːənəs/; Greek: Ὠκεανός Ōkeanós, pronounced [ɔːkeanós]) was a divine figure in classical antiquity, believed by the ancient Greeks and Romans to be the divine personification of the sea, an enormous river encircling the world.

Strictly speaking, Oceanus was the ocean-stream at the Equator in which floated the habitable hemisphere (οἰκουμένη, oikoumene). Thus, the sun rises from the deep-flowing Oceanus in the east and at the end of the day sinks back into the Oceanus in the west. In Greek mythology, this world-ocean was personified as a Titan, a son of Uranus and Gaea. In Hellenistic and Roman mosaics, this Titan was often depicted as having the upper body of a muscular man with a long beard and horns (often represented as the claws of a crab) and the lower body of a serpent (cf. Typhon). On a fragmentary archaic vessel of circa 580 BC (British Museum 1971.11-1.1), among the gods arriving at the wedding of Peleus and the sea-nymph Thetis, is a fish-tailed Oceanus, with a fish in one hand and a serpent in the other, gifts of bounty and prophecy. In Roman mosaics, such as that from Bardo he might carry a steering-oar and cradle a ship.