Parry, Clive Keywords: State responsibility | Diplomatic protection | Mots clefs: Responsabilité des Etats | Protection de nationaux à l étranger | ABSTRACT After an introduction to the development of the theme of the protection of individuals by international law, the author focuses on the issue of the theoretical bases of protection and responsibility. He examines the relationship between protection and nationality, and then the protection of individuals by and against international organizations. Après une introduction consacrée au développement du thème de la pro…