Marius Clarén is a German voice actor, dialogue writer, and dialogue director, born on December 21, 1978. He began his career in voice acting as a child, with his first notable role being the voice of John Connor in the German dub of Terminator 2: Judgment Day. He is the German default voice for several Hollywood actors, including Tobey Maguire, Jake Gyllenhaal, and Andy Samberg. His work spans film, television, and video games.

Clarén's extensive voice acting portfolio includes a wide range of anime and animated series. He is known for providing the German voice of Joe Kido in various Digimon productions. This includes the series Digimon and Digimon 02, as well as the films Digimon Adventure tri. (across its multiple chapters) and Digimon Adventure: Last Evolution Kizuna. Other notable anime roles include Son-Goten as a teenager in Dragon Ball Z, Kiba in Wolf's Rain, and Sōsuke Sagara in Full Metal Panic!. In the animated series Kim Possible, he voiced the character Ron Stoppable and also served as the dialogue director for the show. His work in animation also includes the voice of Simon Seville in the Alvin and the Chipmunks film series.

Beyond his work in front of the microphone, Clarén is also active as a dialogue writer and dialogue director, contributing to the German adaptations of numerous films and series. He is the German voice of the character Peter Parker/Spider-Man as portrayed by actor Tobey Maguire in the original Spider-Man trilogy and has voiced the character in related video games. Other prominent live-action dubbing roles include Jack Twist in Brokeback Mountain, Detective Loki in Prisoners, and Louis Bloom in Nightcrawler. In television, he is the long-standing German voice of Timothy McGee in NCIS and Detective Jake Peralta in Brooklyn Nine-Nine. He has also read audiobooks, such as Töte deinen Boss and Artemis.

In addition to his acting work, Clarén is involved in the voice acting community and has spoken publicly about the importance of the profession. In 2025, he participated in a campaign by the Association of German Voice Actors (VDS) warning against the use of artificial intelligence to generate voices, highlighting the need to protect human artistry in dubbing.