In Greek mythology, Kratos or Cratos (Ancient Greek: Κράτος ("Power")) is the son of Pallas and Styx; he and his siblings Nike ("Victory"), Bia ("Force"), and Zelus ("Zeal") are all essentially personifications. Kratos, along with Bia, make a brief appearance in Aeschylus's Prometheus Bound, where in the opening scene, acting as agents of Zeus, they lead their captive, the Titan Prometheus on stage, and instruct Hephaestus to chain Prometheus to a rock, as punishment for his theft of fire. In Aeschylus's Libation Bearers Electra calls upon Kratos, Dike ("Justice") and Zeus to aid her brother Orestes.
- Aeschylus (?), Prometheus Bound in Aeschylus, with an English translation by Herbert Weir Smyth, Ph. D. in two volumes. Vol 2. Cambridge, Massachusetts. Harvard University Press. 1926. Online version at the Perseus Digital Library.
- Apollodorus, Apollodorus, The Library, with an English Translation by Sir James George Frazer, F.B.A., F.R.S. in 2 Volumes. Cambridge, Massachusetts, Harvard University Press; London, William Heinemann Ltd. 1921. Online version at the Perseus Digital Library.
- Gantz, Timothy, Early Greek Myth: A Guide to Literary and Artistic Sources, Johns Hopkins University Press, 1996, Two volumes: ISBN 978-0-8018-5360-9 (Vol. 1), ISBN 978-0-8018-5362-3 (Vol. 2).
- Hesiod, Theogony, in The Homeric Hymns and Homerica with an English Translation by Hugh G. Evelyn-White, Cambridge, Massachusetts., Harvard University Press; London, William Heinemann Ltd. 1914. Online version at the Perseus Digital Library.