Actaea may refer to:
In Greek mythology (Ἁκταία, from ἁκτή "seashore"):
- Actaea, one of the Nereids
- Actaea, one of the Danaids, daughter of Danaus and Pieria. She married Periphas, son of Aegyptus.
- Actaea, the former name of Attica. It was renamed in honour of Atthis, daughter of Cranaus.
In biology:
- Actaea (plant), a genus of flowering plants
- Actaea (crab), a genus of crabs
In astronomy:
- Actaea, the moon of the trans-Neptunian object 120347 Salacia