Sven Hasper is a German actor, voice actor, dialogue director, and script adapter known primarily for his extensive work in dubbing foreign films and television series for the German-language market. He was born Sven-Jürgen Hasper on October 5, 1965, in Wiesbaden, Germany.

Hasper began working as a voice actor as a student in 1978. He completed his acting training in Berlin in 1984 under Hilde Hessmann. His career took a significant turn when he was cast by executive producer Steven Spielberg at the age of twenty to provide the German dubbing voice for Michael J. Fox in the film Back to the Future. This role established him as the standard German voice for Michael J. Fox, a position he has maintained throughout Fox's career, including his television guest appearances. Beyond Fox, Hasper is also known as the regular German voice for actors including Christian Slater, Scott Eastwood, and T. J. Thyne. He has also dubbed performances for Matthew Broderick, Mark Wahlberg, and Chris O'Donnell, among others.

In the field of anime and animated series, Sven Hasper is recognized for the role of Hei in the German-language version of the anime Darker than Black. He also provides the voice for Alexander von Falkenstein in the popular German animated series Bibi & Tina. However, available records do not confirm the role of Claudius in the series Aeon Flux as part of his filmography.

Hasper's body of work extends beyond voice acting. He has worked as a dialogue director and script adapter (dialogue book author) since 1988. He has translated over seven American movie scripts into German, including O Brother, Where Art Thou?, Bruce Almighty, and Starsky & Hutch. His credits as a dialogue director include major films such as Titanic, Sleepy Hollow, The Day After Tomorrow, and Dr. Dolittle. He has also appeared as an on-screen actor in German television productions such as Affäre Nachtfrost and Die Schwarzwaldklinik. His brother, Kim Hasper, is also a well-known actor and voice actor in Germany.