This paper studies the references to Oceanus made by the three great tragedians in their plays, including the fragmentary ones, and tries to determine whether their vision of this river-god, who represents the origin of all waters, coincides with the ones we found in other authors such as Homer and Hesiod. We also pay special attention to Oceanus’ physical description included in some tragic passages and to the psychological one in the particular case of Prometheus Bound attributed to Aeschylus, where Oceanus comes on stage as an active character.