Johannes Klaußner is a German actor and voice actor born in Hamburg in 1985. He is the son of the well-known German actor Burghart Klaußner. Klaußner began his performance career as a child, appearing on camera from approximately the age of eight.

Within the field of anime voice acting, Klaußner is best known for providing the German dub voice for the character Sakunosuke Oda in the series Bungo Stray Dogs and its film counterpart Bungo Stray Dogs: Dead Apple. In these productions, he lends his voice to the Japanese actor Jun'ichi Suwabe, who voices the original character. Other notable anime roles in his career include the characters Gen Katsugi in Boruto: Naruto Next Generations, Tetsunosuke Ichimura in Katsugeki: Touken Ranbu, and Taizou in Naruto Shippuden.

Beyond his anime-specific work, Klaußner maintains an active career as a live-action film and television actor, with appearances in German productions such as Das Adlon: Eine Familiensaga and Nacht über Berlin. He is also an established audiobook narrator, having recorded titles including the Alex Verus series and Die Waringham Saga. His voice has been featured in the German dub of other international properties as well, such as the children's series Thomas & Friends.