Rōmusha (労務者?) is a Japanese language word for "laborer", but has come to specifically denote forced laborers during the Japanese occupation of Indonesia in World War II. The U.S. Library of Congress estimates that in Java, between 4 and 10 million rōmusha were forced to work by the Japanese military, many of whom toiled under harsh conditions and either died or were stranded far from home. However, the term was not closely defined by either the Japanese or the Allies and the numbers stated sometimes encompasses both the kinrōhōshi unpaid laborers, as well as native auxiliary forces, such as troops of the PETA and voluntary transmigrants to other islands in Indonesia.
The rōmusha were paid conscripted laborers, mobilized in Sumatra and eastern Indonesia as well as Java. Some ten percent were women. Their tenures of service ranged from one day to the time required to complete a specific project. The types of work required were very diverse, ranging from light housekeeping work to heavy construction. As a general rule, the rōmusha were mobilized within each regency and were able to walk to work from home. However, for very large construction projects, the rōmusha could be sent to other regencies. When their specified period was up, they were returned home and replaced with new workers. However, some were sent away from Indonesia to other parts other Japanese-held areas in South East Asia. There included some 270,000 Javanese laborers, of whom only 52,000 were repatriated to Java, suggesting a high death rate or post-war migration.