Nadine Zaddam, also known professionally as Nadine Leopold, is a German voice actor and actress. She was born on February 24, 1982, and completed her acting studies in Munich in 2005. Following her graduation, she appeared in on-screen television productions, including roles in series such as Rote Rosen and Liebes, Leid und Lust. Since 2008, Zaddam has been active as a full-time voice actor, working extensively in dubbing, commercial voice-over, and narration for documentaries and computer games.

Zaddam has provided the German voice for a wide array of characters in animation and live-action series. In the anime and animation realm, she is known for voicing Marche Ovis in the series BeyWheelz: Powered by Beyblade. Her other anime dubbing work includes the role of Ren Kurenai in Beyblade: Shogun Steel and voicing the character Lightning Dust in the German version of the animated series My Little Pony: Friendship is Magic. She has also contributed to anime series such as High School DxD BorN and Senran Kagura.

Beyond animation, her dubbing career encompasses a substantial number of live-action roles. She is the German voice for actresses including Adelaide Kane in Reign, Priyanka Chopra in Quantico, Lili Simmons in Banshee, Natasha O'Keeffe in Peaky Blinders, and Billie Piper in Penny Dreadful. Her film dubbing work includes voicing Margot Robbie in About Time and Felicity Jones in The Amazing Spider-Man 2: Rise of Electro.

A notable achievement in her career is the use of her voice for German speech synthesis. Since the early 2010s, Zaddam's voice has been utilized by Google for its German-language speech synthesis, featuring prominently in products such as Google Assistant and Google Maps. In addition to her voice work, she has continued her on-screen acting, appearing in the ARD daytime soap opera Rote Rosen in 2016. Her recent projects include narration for the documentaries Echtes Leben - Familienleben mit Autismus and Autismus - Das rätselhafte Spektrum.