In Greek mythology, Ismene is a Theban princess. She is the daughter and half-sister of Oedipus, king of Thebes, daughter and granddaughter of Jocasta, and sister of Antigone, Eteocles, and Polynices. She appears in several tragic plays of Sophocles: at the end of Oedipus Rex, in Oedipus at Colonus and in Antigone. She also appears at the end of Aeschylus' Seven Against Thebes.

Oedipus was a mythical Greek king of Thebes. A tragic hero in Greek mythology, Oedipus fulfilled a prophecy that he would end up killing his father and marrying his mother, thereby bringing disaster to his city and family.