Shūgo Oshinari (忍成 修吾 Oshinari Shūgo?, born 5 March 1981 in Chiba, Chiba) is a Japanese actor best known for his roles in the controversial Battle Royale II: Requiem (2003) and Shunji Iwai's film, All About Lily Chou-Chou (2001).

Oshinari also appeared in four music videos by Japanese singer Kumi Koda during the period in which she released twelve singles in twelve weeks. The videos in which he appeared were "You", "Lies", "Feel" and "Someday". He appeared in an episode of Hana Yori Dango as Yuki's boyfriend. Oshinari plays Mitsuru Souda, a crook and friend of Serizawa Naoto in the drama Maou.