Johannes Wolko is a German voice actor born on October 24, 1986, in Munich. He has been active in the field of dubbing since approximately 1990, providing his voice for a wide range of productions including films, television series, documentaries, and computer games. His older brother, Roman Wolko, is also a voice actor.

Wolko is well-known for dubbing roles in numerous live-action productions. Some of his most recognized work in this area includes providing the German voice for the character Peter Pevensie in the Chronicles of Narnia films, Derek Venturi in the series Mensch, Derek!, Oliver Oken in Hannah Montana, and Jeremy Johnson in Phineas and Ferb.

In the realm of anime and animation, Wolko has voiced a variety of significant characters. Among his noted roles are Charce Lacroix in the science fiction series Astra Lost in Space and Kaname Sudou in the action series Darwin's Game. He also voiced Kazuo Wakashika in the mystery series ID: INVADED. His work extends to longer-running series, including the role of Rex Owen in Dinosaur King and the character Paul in the Pokémon anime, specifically in the Pocket Monsters: Diamond & Pearl series. While the role of B Cell in Cells at Work! could not be verified in available sources, Wolko's other anime credits include Shirou Kotomine in Fate/Apocrypha and Heivia Winchell in Heavy Object.