Hamadryas

Hamadryas may refer to:

• Hamadryas (mythology), the daughter of Oreios and mother of the Hamadryads in Greek mythology

Organisms

Hamadryas has been very popular as a genus name, but most of these names are now invalid:

• Hamadryas (butterfly), the genus of of brush-footed butterflies commonly known as the Calicoes, Clicks, or Crackers; established by Hübner in 1806 and still valid
• Hamadryas (plant), a plant genus in family Ranunculaceae, established by Commerson based on de Jussieu in 1789 and still valid
• Hamadryas, the genus of owl butterflies invalidly established by Mikan in or about 1821; now Caligo
• Hamadryas, a genus of milkweed butterflies invalidly established by Boisduval in 1832; now Tellervo
• Hamadryas, the genus of the King Cobra invalidly established by Cantor in 1838; now Ophiophagus
• Hamadryas, the genus of baboons invalidly established by Lesson in 1840; now Papio
  • The Hamadryas Baboon, Papio hamadryas
• Hamadryas, a genus of bulimuline snails invalidly established by Albers in 1850; now Otostomus
• Hamadryas, the genus of the Manchester Moth invalidly established by Clemens in 1864; now Euclemensia