Diotima of Mantinea (; Greek: Διοτίμα; Latin: Diotīma) is the name or pseudonym of an ancient Greek character in Plato's dialogue Symposium, possibly an actual historical figure, indicated as having lived circa 440 B.C. Her ideas and doctrine of Eros as reported by the character of Socrates in the dialogue are the origin of the concept today known as Platonic love.