Kōichi Yamadera (b. 1961) is a Japanese voice actor and radio host who dubbed Kermit the Frog in the Japanese dub of The Muppet Christmas Carol.
Yamadara is best known for his voice work in anime, notably as Spike Spiegel on Cowboy Bebop, as well as Mew in Pokémon: The First Movie, Ryoga on Ranma 1/2, and Batman in Batman Ninja. He is the Japanese voice of Eddie Murphy, Jim Carrey, Robin Williams in Mrs. Doubtfire and others, and Chris Pratt in the Marvel Comics movies. Disney characters include Donald Duck, Beast in Beauty and the Beast, Genie in Aladdin, and Stitch. Yamadera's on-camera credits include two Godzilla movies.