The Governor of the South Pacific Mandate was an official who ruled the Japanese South Pacific Mandate, a mandated territory in the Pacific Ocean under the administration of the Empire of Japan, between 1922 and 1944. The territory consisted of islands awarded to Japan by the League of Nations after World War I, prior to which they had been part of the German colonial empire. After World War II the United Nations placed the territory under United States administration as the Trust Territory of the Pacific Islands. The islands are now part of Palau, Northern Mariana Islands, Federated States of Micronesia, and Marshall Islands.