The rules concerning the relation of international law to internal law in Austria have undergone less change than those of many other European countries since the end of World War I. The relevant provisions of the Austrian Federal Constitution of October 1, 1920, were not affected by the subsequent constitutional reforms. These rules had been the subject of much theoretical discussion before a sizable body of constitutional usage and relevant jurisprudence had developed. The present article aims at examining and supplementing these theories in the light of current practice.