Celaenus may refer to:
In Greek mythology (Κελαινός Kelainos):
Celaenus, son of Poseidon and the Danaid Celaeno Celaenus, father of Tragasia who was a possible spouse of Miletus Celaenus, son of Phlyus and father of Caucon See Celaenus (mythology)
In biology:
Hasora celaenus, a species in the genus Hasora