Marianne Graffam is a German actress and voice actor known for her extensive work in dubbing foreign productions, particularly anime and video games, for the German market. Born in Hamburg in 1977, she studied acting at the Central School of Speech and Drama in London, gaining experience in theatre and musicals before beginning her career as a voice actor in Germany around 2005.

Graffam is recognized for providing the German voice for several prominent anime characters. She voiced the kind-hearted and wealthy keyboardist Tsumugi Kotobuki across all installments of the highly popular K-ON! franchise, including the television series K-ON! and K-ON!!, its extra episodes, and the K-ON! movie. She is also the voice of the titular character Hinako in the interactive fitness anime series Isshoni Training: Training with Hinako and its sequel Isshoni Sleeping: Sleeping with Hinako.

Beyond these roles, her anime dubbing work spans a variety of films and series. She voiced Flora Reinhold in Professor Layton and the Eternal Diva, Shino in Wolf Children, and Rachel Cheong in Case Closed: The Fist of Blue Sapphire. Her voice is also featured in the German versions of series such as Die Schule der kleinen Vampire and films like Vexille.

Graffam is equally prolific in the realm of video games. She is the long-standing German voice of the character Rouge the Bat in the Sonic the Hedgehog series, a role she has voiced consistently since Sonic Generations in 2011, appearing in numerous sequels and crossover titles like the Mario & Sonic at the Olympic Games series. Her other notable game credits include Micaiah in Fire Emblem: Radiant Dawn, Claire Folley in Professor Layton and the Lost Future, Aquilina Schiller in the Inazuma Eleven series, Yugiri in Final Fantasy XIV, and the character 5-Volt in the WarioWare series. In addition to her voice work, Graffam has also worked as an on-screen actress in German film and television productions.