Argia /ɑːrˈdʒaɪə/, Argea /ɑːrˈdʒiːə/, or Argeia^[1] (Ancient Greek: Ἀργεία) may refer to several figures in Greek mythology:

• Argia, one of the 3,000 Oceanids, water-nymph daughters of the Titans Oceanus and his sister-spouse Tethys.^[2] She was the mother of Phoroneus, by her brother Inachus, a river-god of Argos.^[3] Argeia may also have been the mother (by Inachus) of Io.^[4]
• Argia, wife of Polybus and mother of Argus.^[5] The later was the builder of the ship Argo from the story of Jason and the Argonauts.^[6] Others credited Danaus^[7] or Arestor^[8] to be this Argus' father.
• Argia, an Argive princess as the daughter of King Adrastus and Amphithea, daughter of Pronax. She married Polynices, son of Oedipus and bore him three sons: Thersander,^[9] Adrastus and Timeas.
• Argia, a Theban princess as the daughter of King Autesion. She married Aristodemus and became the mother of twins, Eurysthenes and Procles, the ancestors of the two royal houses of Sparta.^[10]
• Argeia, was also an epithet of the Greek goddess Hera derived from Argos, the principal seat of her worship.