Sebastian Fitzner is a German voice actor born on February 27, 1994. He has been active in the dubbing industry since 2004, providing German voices for a wide range of characters in anime, live-action films, and television series.

Fitzner is perhaps best known for being the regular German voice of Izuku Midoriya, also known as Deku, in the long-running anime series My Hero Academia and its associated films, including My Hero Academia: Two Heroes, My Hero Academia the Movie -Heroes: Rising-, and My Hero Academia THE MOVIE: World Heroes' Mission. Another significant and long-running role is that of Ciel Phantomhive in the Black Butler anime series, appearing in installments such as Black Butler: Book of Murder, Black Butler: Book of the Atlantic, and Black Butler: His Butler, Performer.

His work in anime covers a wide variety of prominent series. He voices Ray in The Promised Neverland, Atsushi Nakajima in Bungo Stray Dogs, and Hodaka Morishima in the film Weathering With You. In the Dr. Stone franchise, he provides the voice for Ginrou, appearing in Dr. Stone, Dr. Stone: Stone Wars, and Dr. Stone: New World. He is also the voice of Valt Aoi in multiple Beyblade Burst series, including Beyblade Burst Turbo, Beyblade Burst GT, Beyblade Burst Sparking, and Beyblade Burst QuadDrive. Other noted anime roles include Shun Kaidou in The Disastrous Life of Saiki K.: Reawakened, Asahi Shiina in Free! -Dive to the Future-, and Kazushi Yamagishi in Tokyo Revengers.

Beyond anime, Fitzner is widely recognized as the German dubbing voice for actor Jacob Batalon, playing Ned Leeds in the Marvel Cinematic Universe films such as Spider-Man: Homecoming, Avengers: Infinity War, and Spider-Man: No Way Home. He also voiced Carl Grimes in the later seasons of The Walking Dead and has lent his voice to characters in major films like 1917 and Sonic the Hedgehog. His work also extends to video games, where he is known for voicing Hans Capon in Kingdom Come: Deliverance and its upcoming sequel.

In 2022, Fitzner was a contestant on the German television quiz show Wer wird Millionär? (Who Wants to Be a Millionaire?), where he won 16,000 euro.