Timmo Niesner is a German actor who works extensively as a voice actor, dialogue book author, and dialogue director. He was born in Berlin in 1971 and began his acting career as a child, achieving recognition at the age of twelve in the German television series Ich heirate eine Familie. His primary body of work is in German dubbing, where he provides the German-language voice for actors in international film and television productions, as well as for characters in animated series and video games.

In the field of anime and animation, Niesner has contributed his voice to several notable series. He is the German voice for the character Eduardo Petrov in the 2020 Netflix anime series Cagaster of an Insect Cage. Other prominent anime roles include Ken Ichijoji, also known as the Digimon Kaiser, in Digimon Adventure 02, and Kintaro Oe in Golden Boy. He also voiced Kakyō Kuzuki in the series X and Parn in Record of Lodoss War. His work extends to providing the German voice for the character WALL·E in the Pixar film of the same name.

A significant part of Niesner's career is defined by recurring collaborations, though these are primarily with live-action actors for whom he is the official German dubbing voice. He is best known as the standard German voice for actor Elijah Wood, a role that includes portraying Frodo Baggins in The Lord of the Rings film trilogy. He also regularly dubs the voices of actors Tom Welling, Peter Sarsgaard, Topher Grace, Zachary Quinto, and Eddie Redmayne.

Beyond dubbing, Timmo Niesner has achieved recognition for his work in audio dramas and audiobooks. He is a featured speaker for major German audio publishers. His narration of various audiobooks has been nominated for and received accolades, including being long-listed for the Preis der deutschen Schallplattenkritik and being included on the hr2-Hörbuchbestenliste. He also served as the dialogue director for the German version of the acclaimed television series Lost.