Markus Pfeiffer is a German actor and voice artist, born in Stuttgart in 1967. He pursued acting training at the Schauspielstudio Hildberg Frese in Hamburg from 1989 to 1992 and gained early experience on stage at the Altonaer Theater. While he has appeared in front of the camera in various German television series, including a long-running role in the series Die Fallers – Die SWR Schwarzwaldserie, his work as a voice actor, particularly in dubbing, constitutes a significant part of his career.

In the realm of anime and animation, Pfeiffer is well-known for providing the German voice for a wide array of characters. He is the German voice of the titular character in the various adaptations of Osamu Tezuka's Black Jack. This includes the Black Jack OVA series, the film Black Jack The Movie, and Black Jack: Capital Transfer To Heian. His performance as the unlicensed genius surgeon has been noted for its effectiveness, particularly in his scenes with Diana Borgwardt, who voices Pinoko. His other prominent anime roles include Franco in Gunslinger Girl: Il Teatrino and Thomas in the Studio Ghibli film Earwig and the Witch.

Beyond these specific roles, Pfeiffer's voice is featured in a vast number of other German anime dubs. He is the German voice of Uryu Ishida in the Bleach series and its films. He has also voiced Kaname Ohgi in Code Geass: Lelouch of the Rebellion, Kyros in One Piece, and Sikorsky in the Baki ONA series. Other notable credits include Jin in Samurai Champloo, Klaus Valca in Last Exile, Harry McDowell in Gungrave, and Yoki in Fullmetal Alchemist: Brotherhood. His range also extends to classic and well-known titles, having voiced characters such as Kaworu Nagisa in the film versions of Neon Genesis Evangelium and Chao-Zu in Dragon Ball.

Pfeiffer's career as a voice actor is not limited to anime. He is one of the most recognizable voices in German dubbing for live-action film and television, regularly voicing international stars like Paul Rudd, Adrien Brody, Colin Farrell, and Sacha Baron Cohen. He is also the German voice of Tom Cruise in the Mission: Impossible film series. In the world of video games, he is renowned for his portrayal of the protagonist Geralt of Rivia in the German versions of The Witcher 2: Assassins of Kings and The Witcher 3: Wild Hunt.