Sven Dahlem, born in 1947 as Sven Mahler, is a German actor and voice artist whose career spans theater, television, radio plays, and extensive dubbing work. He adopted his stage name during his professional training at the Hildburg Frese drama studio in Hamburg, choosing it in reference to the Berlin district of Dahlem. His acting foundation was built in theater, with engagements at venues such as the Staatstheater Darmstadt and numerous Hamburg stages, including the Thalia Theater, the Ohnsorg Theater, and the St. Pauli Theater, where he frequently performed in musicals like My Fair Lady and Kiss Me, Kate. Between the 1980s and early 2000s, he also made occasional guest appearances in German television series such as Tatort, Großstadtrevier, and Adelheid und ihre Mörder.

Dahlem's voice work is extensive and began in the 1960s with commercial radio plays for the Europa label. He became a familiar voice to younger audiences through his role as Heppo in the German version of the children's series Bob der Baumeister. In the realm of animation and anime dubbing, he is known for providing the German voices for various characters. He voiced Ben and Lehrer McKenzie in the German dub of the anime series Lucy-May of the Southern Rainbow. He was also heard in the German version of the cartoon series Die Raccoons (The Raccoons), lending his voice to characters such as Ranger Dan. His work further includes roles in the anime series Naruto and Boruto: Naruto Next Generations.

His dubbing filmography, which comprises well over one hundred roles, demonstrates a broad range, from character roles in live-action films to major animated features. He has been the regular German voice for actor Ron Pardo, most notably as Mayor Humdinger in the Paw Patrol film series, including Paw Patrol: The Movie and Paw Patrol: The Mighty Movie. Other prominent dubbing credits include providing the German voice for Christopher Lloyd in films such as Dead Before Dawn, voicing characters in the animated feature Quest for a Heart, and dubbing actors like Bob Odenkirk in The Spectacular Now and Edward Fox in Katharina von Alexandrien. In addition to his work as a voice actor, Dahlem has also been active as a dialogue script writer and director for animated series.