In Greek mythology, Demonassa or Demonassae (Ancient Greek: Δημώνασσα) was a name attributed to five women. * Demonassa, mother of Eurydamas and Eurytion, king of Phthia, by Irus. Otherwise, Eurydamas parentage was given as Ctimenus from Dolopian Ctimene. * Demonassa, wife King Poeas of Meliboea, by whom she bore Philoctetes. Otherwise, the mother of the hero was called Methone. * Demonassa, mother of Aegialeus by Adrastus. * Demonassa, daughter of Amphiaraus, king of Argos and Eriphyle, and thus, sister to Alcmaeon, Amphilochus, Eurydice, Alcmena and Alexida. She married Thersander and had a son, Tisamenus.