Masachi Osawa

is a Japanese sociologist and philosopher. Outside Japan, he is best known as a social scientist, often mentioned in reference to sociological and philosophical research on otaku culture and popular Japanese animation series such as Ghost in the Shell: Stand Alone Complex.

Background Osawa received his Ph.D. in sociology from the University of Tokyo in 1990. His Ph.D. thesis is . His supervisor was Munesuke Mita. He is one of the most influential sociologists in Japan and a prolific author. He has taught at Chiba University and Kyoto University.

Works Osawa is known for proposing a form of body theory that is concerned with how our life-world is constructed, particularly the process that yields norm and meaning. He assumes that the coordination between more than two bodies, which includes physical objects, sustains all human activities. Such coordination, which Osawa called as "inter-bodily chain" is the basis of our experiences.

The sociologist also labeled the period starting from 1995 onwards as the Age of Impossibility in contrast the Age of Virtuality (1970-1995). The former described a decline of totality in contemporary society while the latter, which was equated with virtuality, was an era when reality was relativized.