Alessandro Passerin d'Entrèves (also known in French as Alexandre and in English as Alexander; and sometimes referred to as Passerin d'Entrèves et Courmayeur; and known professionally in English as A. P. D'Entreves) (Turin, 26 April 1902 – 15 December 1985) was an Italian philosopher and historian of law.
He was noted for his scholarship on political thought, particularly in the mediaeval and early modern period, and natural law theory.
D'Entreves was involved in the Italian resistance during World War II in the Aosta Valley.
His most notable books include The Medieval Contribution to Political Thought, Thomas Aquinas, Marsilius of Padua, Richard Hooker (Oxford University Press) (1939); Natural Law: An Introduction to Legal Philosophy (1951) (regarded as a classic study of the subject);[3] Dante as a Political Thinker (Oxford University at the Clarendon Press)(1952); and The Notion of the State: An Introduction to Political Theory (OUP, 1967).
His hobbies included alpinism, and he also had "a deep interest in and love of music" and was an "avid collector of classical records".