Tsutomu Ōsugi (born January 10, 1985; commonly transliterated as Tsutomu Oosugi) is a Japanese professional wrestler currently working as a freelancer. He is best known for his tenures with Michinoku Pro Wrestling and Big Japan Pro-Wrestling, winning tag team championships in those promotions with Tatsuhito Senga (both under various gimmick names) as Speed of Sounds (SOS).