The Japanese occupation of both British Borneo – Brunei, Sarawak and North Borneo – and Dutch Borneo in 1941 to 1945 is a much understudied subject. Of particular interest is the occupation of Dutch Borneo, governed by the Imperial Japanese Navy that had long-term plans for ‘permanent possession’. This book surveys Borneo under Western colonialism, examines pre-war Japanese interests in Borneo, and analyses the Japanese military invasion and occupation.