This article is about a/an actor and suit actor in the Kamen Rider Series.

Takehisa Yamaguchi (山口 豪久 Yamaguchi Takehisa?, January 25, 1945-April 6, 1986), born Tomoyuki Yamaguchi (山口 智之 Yamaguchi Tomoyuki?) was a Japanese actor who played Joji Yuki (Riderman) in Kamen Rider V3. He also acted as suit actor for Riderman. He reprised his role as Joji in Kamen Rider Stronger, Kamen Rider (Skyrider) and was the suit actor for Riderman in Five Riders vs. King Dark.

In the other 4 episodes of Kamen Rider (Skyrider) where Riderman appeared, he was portrayed by suit actor Junichi Iwai (岩井 潤一 Iwai Jun'ichi?) alongside assorted voice actors. He later returned as Joji alongside Shunsuke Takasugi (Kazuya Oki) and Hiroshi Miyauchi (Shiro Kazami) in Birth of the 10th! Kamen Riders All Together!!.

He was credited as Satoru Yamaguchi (山口 暁 Yamaguchi Satoru?). He was also known as Akira Yamaguchi (山口 あきら Yamaguchi Akira?). Yamaguchi is notably the earliest-born actor to portray a Kamen Rider, with his birth preceeding that of Hiroshi Fujioka by over one year, also making him the only such actor to have been born prior to the end of World War II.

Sadly, Takehisa Yamaguchi passed away on April 6 1986, at the age of 41. He was the first actor who played a Kamen Rider to die. After his death, Riderman would be portrayed by several voice actors and suit actors in his later appearances.

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