Diez De Velasco, Manuel Keywords: Companies | Diplomatic protection | Shareholde | Mots clefs: Sociétés | Protection de nationaux à l'étranger | Actionnaires | ABSTRACT Diplomatic protection of companies and shareholders is an important aspect of diplomatic protection of foreign nationals. A series of issues related to diplomatic protection and the theory of international responsibility are discussed in this theme. Manuel Diez de Velasco, Professor at the University of Madrid, devotes the introduction of his course to t…