- For the Roman-era writer, see Pomponius Porphyrion.
- "Porphyrion" is also a section of the genus Saxifraga.
In Greek mythology, Porphyrion (Greek: Πορφυρίων) was one of the Gigantes (Giants), who according to Hesiod, were the offspring of Gaia, born from the blood that fell when Uranus (Sky) was castrated by their son Cronus. According to the mythographer Apollodorus, Porphyrion was (along with Alcyoneus), the greatest of the Giants, and during the Gigantomachy, the epic battle between the Giants and the Olympian gods, Porphyrion attacked Heracles and Hera, but Zeus caused Porphyrion to become enamoured of Hera, whom Porphyrion then tried to rape, but Zeus struck Porphyrion with his thunderbolt and Heracles killed him with an arrow. According to Pindar, who calls him "king of the Giants", he was slain by an arrow from the bow of Apollo.
He is named on a sixth century BC black-figure pyxix (Getty 82.AE.26), where he and the Giant Enceladus oppose Zeus, Heracles and Athena, as well as a late fifth century BC red-figure cup from Vulci (Berlin F2531), where he is battling with Zeus. He was also probably named on the Gigantomachy depicted on the north frieze of the Siphnian Treasury at Delphi (c. 525 BC). He was one of the many Giants depicted on the second century BC Pergamon Altar Gigantomachy frieze, where he is shown fighting Zeus.
- For the birth of the Gigantes see Hesiod, Theogony 185. Hyginus, Fabulae Preface gives Tartarus as the father of the Giants.
- Apollodorus, 1.6.1–2. Compare with Aristophanes, The Birds 1249 ff.: "a single Porphyrion gave him [Zeus] enough to do."
- Pindar, Pythian 8.12–18.
- Nonnus, Dionysiaca, 48.6–22 (pp. 424–427).
- Beazley Archive 10148 Fragment: Heracles, Athena, horses of Zeus' chariot, Porphyrion and Enceladus.
- Beazley Archive 220533: detail showing Zeus v. Porphyrion; Cook, p. 56, Plate VI.
- Brinkmann, N22 p.103, which finds traces of "rion"; Stewart, plate 196.
- Ridgeway, p. 54 note 35.
- Apollodorus, Apollodorus, The Library, with an English Translation by Sir James George Frazer, F.B.A., F.R.S. in 2 Volumes. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1921. Online version at the Perseus Digital Library.
- Cook, Arthur Bernard, Zeus: A Study in Ancient Religion, Volume III: Zeus God of the Dark Sky (Earthquakes, Clouds, Wind, Dew, Rain, Meteorites), Part I: Text and Notes, Cambridge University Press 1940. Internet Archive
- Hesiod, Theogony, in The Homeric Hymns and Homerica with an English Translation by Hugh G. Evelyn-White, Cambridge, MA.,Harvard University Press; London, William Heinemann Ltd. 1914. Online version at the Perseus Digital Library.
- Hyginus, Gaius Julius, The Myths of Hyginus. Edited and translated by Mary A. Grant, Lawrence: University of Kansas Press, 1960.
- Nonnus, Dionysiaca; translated by Rouse, W H D, III Books XXXVI–XLVIII. Loeb Classical Library No. 344, Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1940. Internet Archive]
- Pindar, Odes, Diane Arnson Svarlien. 1990. Online version at the Perseus Digital Library.
- Ridgeway, Brunilde Sismondo, Fourth-century Styles in Greek Sculpture, Univ of Wisconsin Press, 1997. ISBN 9780299154707.
- Stewart, Andrew F., Greek Sculpture: An Exploration, Yale University Press, 1990.