International law was historically conceived as the rules legally binding on states in their relations with each other. But in modern times a more multi-faceted view of legal relations in international law is emerging. It is the aim of my thesis to examine the position of the individual in the international legal system. The first part of the thesis sets out the classical framework of the international legal system. The second part of the thesis contains an examination of four significant areas of international law: mixed claims, international humanitarian law, international criminal law and human rights law, explaining how and to what extent individuals have rights and obligations.The final part of the thesis asks whether the situation reflected in these four fields can any longer be accommodated within the four corners of the classical framework, and what alternative framework might be posited which takes due account of the reality of individuals in the international legal system.