Frank Stieren is a German actor and voice actor known for his work in film, television, and anime dubbing. Born on February 10, 1966, in Oelde, Westphalia, he completed his acting training at a private drama school in Berlin from 1989 to 1992.

While Stieren has an extensive career in live-action German television and film, including roles in series such as Tatort, Der Alte, Die Rettungsflieger, and Der Landarzt, he is also active as a voice actor for dubbing projects. In the field of anime, his most recognized role is providing the German voice for Killer B in the Naruto franchise. For example, he performed this role in the film Naruto Shippūden: Blood Prison.

Beyond his voice work for anime, Stieren is an established audiobook narrator. His readings include works such as Kriegslicht by Michael Ondaatje, Kleine große Schritte by Jodi Picoult, and the Krähen duology by Leigh Bardugo. No information is available regarding other specific anime voice roles, recurring collaborations with particular directors or studios, or other notable achievements specific to his voice acting career.