Anna Kumosiak is a German voice actress, actress, and singer known for her work in German-language dubbing of anime and animated series. She is recognized as the first German voice of the character Kurotsuchi, the Fourth Tsuchikage, in the Naruto and Boruto franchise. Kumosiak voiced Kurotsuchi initially in the film Boruto: Naruto the Movie and continued the role in the subsequent television series Boruto: Naruto Next Generations and later episodes of Naruto Shippuden.

Beyond the Naruto universe, her voice acting portfolio includes a variety of roles in animated productions. She provided the voice for Jewels Sparkles in the German version of the children's series Lalaloopsy, for which she also sang the title song. She voiced the character Posie Prue in Corn & Peg and Big Barda in DC Super Hero Girls. Her work in anime also includes the role of Elisabet von Koralle in Wise Man's Grandchild.

Kumosiak has a background in both acting and vocal performance. She completed her acting training at the Schauspielschule Siegburg and further studied musical theater at the Stella Academy in Hamburg. Her professional experience extends to stage work, including comedy and musical theater, as well as serving as a voice and acting coach. In addition to animation, she has worked as a dubbing voice for live-action series, with roles in productions such as 1883, The Tunnel, and Over Water.