Koichi Yamadera is a Japanese voice actor and radio personality, known for voicing Jim Carrey and Eddie Murphy in the Japanese language releases of their respective films. In 2006, he divorced voice actress Mika Kanai.
- Known For: Acting
- Birthday: 1961-06-17
- Place of Birth: Shiogama, Miyagi Prefecture, Japan
- Also Known As: Kohichi Yamadera, 山寺 宏一, やまでら こういち, バズーカ山寺, Bazooka Yamadera, Yama-chan, 山ちゃん, 야마데라 코우이치, Kōichi Yamadera, Kouichi Yamadera, Koichi Yamadera, 山寺宏一