Leonard Rosemann, born on March 6, 1998, is a German voice actor known for his extensive work in dubbing anime and live-action series for the German market. His full name is Leonard Nikolai Rosemann. He began his voice acting career at a young age, with early credits including roles in family-oriented films and animated series.

Rosemann has lent his voice to a wide array of characters in prominent anime series. He is the German voice of Akane Yanagi in the series Horimiya and its sequel, Horimiya: The Missing Pieces. In the fantasy adventure Drifting Dragons, he voices the character Soraya. He also appears in the long-running Pokémon franchise as Ren in Pokémon Journeys: The Series. His repertoire includes the role of Yuuki Mishima in Persona 5 the Animation, Kash Winger in Akashic Records of Bastard Magical Instructor, and Ranmaru Fujieda in the film Haikara-San: Here Comes Miss Modern Part 1 and its sequel. Beyond these, his anime credits also include roles in Darwin's Game, Yashahime: Princess Half-Demon, Record of Ragnarok, and the film A Whisker Away.

His work frequently involves dubbing the performances of notable Japanese voice actors. For instance, he voices characters originally played by Jun Fukuyama, such as Akane Yanagi in Horimiya, and by Yuuki Kaji, such as Ranmaru Fujieda in the Haikara-San films. In addition to anime, Rosemann has a substantial body of work in live-action dubbing. He is the German voice for characters in major series such as Game of Thrones (Tommen Baratheon), Once Upon a Time (Henry Mills), and High School Musical: Das Musical: Die Serie (Carlos Rodriguez). He also voiced the lead character Oliver Quick in the film Saltburn. His career is marked by a high volume of roles, with over 85 credited speaking parts documented in German dubbing databases.