The Introduction of the Cult of Sarapis to Delos in the third century B. C. Kyozo NAKAO Sarapis, who was originally an Egyptian god, Wsir-Hp, was introduced to the Mediterranean world from Memphis in the Hellenistic era. P. M. Fraser studied the foundation of its cult in Alexandria and its expansion to Greek world. This article examines Fraser's theory by analyzing the introduction of the cult of Sarapis and the establishment of its temple in Delos.The cult of Sarapis was introduced to Delos, one of the Cycladic islands, by Apollonius I, an Egyptian priest from Memphis, in the first half of the third century BC. Then in the second half of the century, Apollonius II, his grand son, established a temple of Sarapis, Serapeum A. Its story was recorded on the inscription of Serapeum A, IG XI 4 1299. The analysis of that inscription shows that the introduction of cult of Sarapis and the establishment of its temple was privately carried out by the family of Apollonius I. The inscriptions of dedications found in three temples of Sarapis, Serapeum A-C, reveal that people in Delos worshipped not only Sarapis but also Isis and Anubis. This is different from the worship in Egypt. These facts contradict Fraser's theory that the cult of Sarapis spread from Alexandria. I therefore argue that the cult of Sarapis was directly introduced from Memphis to Delos without the Hellenizing process in Alexandria .