Cocytus may refer to:
- The enemy ability from Crisis Core -Final Fantasy VII-.
- The enemy from Final Fantasy XIII-2.
- The weapon from Final Fantasy XV.
- The character from Final Fantasy Dimensions.
- The weapon from Final Fantasy Record Keeper.
Cocytus, meaning "the river of wailing," is a river in the underworld in Greek mythology. In Dante's Inferno, Cocytus is the ninth and lowest circle of Hell where traitors are frozen in a lake of ice, Satan is imprisoned waist deep in ice at the very center of Hell.