Shō Jinnai is a Japanese actor who has performed in both live-action productions and anime voice acting. He was born on January 16, 1988, in Kumamoto, Japan. He is affiliated with Watanabe Entertainment Co., Ltd..

Jinnai is primarily known for his live-action roles, particularly his portrayal of the villain Enter in the 2012 Super Sentai series Tokumei Sentai Go-Busters and its subsequent film adaptations. His acting career also includes appearances in other television dramas and films, such as High & Low: The Worst and its related projects, as well as the television series Keiji 110 kiro. In addition to screen work, he has an extensive background in stage theater. A significant stage role was his performance as Tenma Sumeragi in the stage adaptation of A3!, a role he played from the production's inception until 2025.

While his filmography is predominantly in live-action, Jinnai has contributed to anime voice acting. He was cast in the 2021 original short anime series Dinosaur Biyori, a slice-of-life comedy about dinosaurs cohabitating in a modern apartment. In this series, he provided the voices for two characters: the Ankylosaurus and a character known as Crocodile-senpai. These roles represent a foray into voice acting for the performer, who noted the relaxed atmosphere of the recording sessions for the show.