Dirk Müller is a German voice actor and dialogue director, born on February 3, 1965, in Viersen, Germany. He has been active in the synchronization industry since 1992, lending his voice to thousands of roles in films, television series, and animated productions.

While Müller has an extensive filmography, his work encompasses a significant number of anime and animated projects. He is known for providing the German voice for the character Barnaby Brooks Jr. in the anime series Tiger & Bunny, including its second season, Tiger & Bunny 2. In the Digimon franchise, he voices the creature Armadillomon, a role he performed in the 2020 film Digimon Adventure: Last Evolution Kizuna. He continued his involvement with the series, also voicing Armadimon in the subsequent 2023 film, Digimon Adventure 02: The Beginning. His other anime credits include roles in various Lupin III productions, such as voicing Makio Inaniwa in Lupin the 3rd: Goemon Ishikawa, the Es Bloodletting and Barry Nelson in Genocidal Organ. He also contributed to the German dubbed version of Ghost in the Shell and Dragonball Z: Die Todeszone des Garlic Jr..

Beyond anime, Müller has built a prolific career as a voice actor for live-action content. He is the German voice of actor Jason Narvy, who played Eugene "Skull" Skullovitch in the Power Rangers franchise, a role he voiced across multiple series and films throughout the 1990s. He also voiced Peter Lamb's character Colt in The Matrix Reloaded and The Matrix Revolutions. In the Star Trek universe, he has voiced numerous characters, including Hikaru Sulu in new scenes for the original series.

In addition to his work as a voice actor, Dirk Müller is also active as a dialogue director and script writer for German dubs. His directorial work includes writing the dialogue books and directing the German synchronization for acclaimed series such as The Queen's Gambit, Poldark, and Shadowhunters.