Japanese settlement in Papua New Guinea

Japanese settlement in the Territory of Papua and German New Guinea (in what now constitutes modern-day Papua New Guinea) dates back to the early 20th century when migrants from Japan established copra plantations and trading businesses in the islands, specifically Rabaul. The Japanese community remained small throughout the first half of the 20th century, although there were Japanese migrating in and out of New Guinea in different years from 1901 to 1945, it generally never exceeded more than 100 as a whole community. Some Japanese stayed for short terms and were replaced by newer emigrants from Japan, others stayed for longer periods depending on their roles. Most Japanese in Papua were businessmen and plantation managers, although a few became fishermen. As almost all the migrants were men, many of them married local Papuan wives and raised mixed-race Japanese-Papuan families while other Japanese men staying only for short periods also had sexual cohabitations with local Papuan women, but in most cases without marrying. Many of them did produce offspring but they were generally abandoned by their Japanese fathers (some of whom were already married with children in Japan) and raised by their single Papuan mothers or sent to the orphanage. These abandoned mixed-race children's were recorded as ethnic Papuans in the census as the ethnicity of their fathers was unknown.

During World War II, the Imperial Japanese Army invaded New Guinea with 350,000 troops and occupied most of its territory from January 1942 to August 1945. Some Papuan women including mixed-race Japanese-Papuan women were forced to become comfort women. Most Japanese in the unoccupied areas of New Guinea were deported to Australia where they were confined. The majority of them were repatriated to Japan after the war, although their mixed-race children were allowed to remain behind and assimilated with the local populace. Official estimates show 207 Japanese-Papuan mixed descendants.