On Justice (Greek: Περὶ Δικαίου; Latin: De Justo[1]) is a Socratic dialogue that was once thought to be the work of Plato.[2] In the short dialogue, Socrates discusses with a friend questions about what is just and unjust.[3]

This work is not to be confused with Plato's Republic, whose alternate title in ancient times was also On Justice.


  1. ^ Henri Estienne (ed.), Platonis opera quae extant omnia, Vol. 3, 1578, p. 372a,bis-373d. The reference text is now Platonis Opera, ed. John Burnet, vol. 5, Oxford 1907 (repr. 1967), St[ephanus' volume] III, pp. 372a-373d. Burnet's text is paginated after Stephanus'. The online database Thesaurus Linguae Graecae: A Digital Library of Greek Literature [short: TLG] starts the text at Stephanus' page a,bis.
  2. ^ The attribution to Plato is now considered spurious[citation needed]
  3. ^ John Madison Cooper, D. S. Hutchinson, (1997), Plato, Complete works, p. 1687. Hackett Publishing.