The Ohara Institute for Social Research, Hosei University, is a research institute specializing in labor and social issues.  In addition to its research activities, the institute serves as a library and an archive of books and primary materials related to labor and social issues.  The institute, founded in 1919, is one of the oldest research institutes in the fields of social science in Japan.  The institute took its name from its founder, Magosaburo Ohara, a business magnate from Kurashiki, Okayama Prefecture. In 1949, the institute became affiliated with Hosei University.

 OISR.ORG is an official website of the Ohara Institute for Social Research. OISR is an acronym of the Ohara Institute for Social Rresearch.