Oannes may refer to:
- The enemy from Final Fantasy XIII-2.
- The boss from Final Fantasy XIV.
- The enemy from Final Fantasy Mystic Quest.
Oannes as having the body of a fish but underneath the figure of a man. He is described as dwelling in the Persian Gulf, and rising out of the waters in the daytime and furnishing mankind instruction in writing, the arts and the various sciences.Oannes was the name given by the Babylonian writer Berossus in the 3rd century BCE to a mythical being who taught mankind wisdom. Berossus describes