Diogeneia (/daɪoʊˈdʒiːniə/; Ancient Greek: Διογένεια) may refer to three women in Greek mythology:

• Diogeneia, daughter of the river god Cephissus and the wife of Phrasimus by whom she became the mother of Praxithea, wife of King Erechtheus.^[1]
• Diogeneia, an Eleusinian princess as one of the daughters of King Celeus and Metanira.^[2]
• Diogeneia, daughter of Phorbas, from Olenus in Achaea, and possibly Hyrmina, thus sister to Augeas,^[3] Actor^[4] and Tiphys.^[5] She was the wife of King Alector of Elis and mother of Amarynceus.^[6] Otherwise, the latter was called the son of Onesimachus^[7]