Ōsugi, Osugi, Oosugi or Ohsugi is a Japanese surname. Notable people with the surname include:Isamu Osugi, Japanese mixed martial artist Katsuo Osugi , Japanese baseball player Kumiko Ōsugi , Japanese singer Masato Osugi , Japanese footballer Ren Osugi , Japanese actor Sakae Ōsugi , Japanese anarchist Tsutomu Oosugi , Japanese professional wrestler