Marie Diot is a French voice actress known for her extensive work in the dubbing of anime and animated series into French. Her career is marked by a wide range of roles, lending her voice to numerous prominent characters in popular series and films.

Diot has provided the French voice for several major anime characters. She is notably the voice of C.C. in the anime series Code Geass: Lelouch of the Rebellion and its sequel film, Code Geass: Lelouch of the Re;surrection. She also voiced the character Julia in the film trilogy Shin Kyūseishu Densetsu Hokuto no Ken, which includes the titles Kenshirō-den and Yuria-den. Her other significant anime roles include Misato Katsuragi in the film Evangelion: 1.0 You Are (Not) Alone, Winry Rockbell in Fullmetal Alchemist: Brotherhood, and Ciel Phantomhive in the Black Butler series.

Beyond these, Diot's dubbing work is quite diverse, covering a broad spectrum of characters across different series and films. Her filmography includes voicing Shikimi in Himawari!, Saeko Shirasu in FLAG Director's Edition, Miki in Tokyo Marble Chocolate, Michiru Kita in Zombie-Loan, Reiko Ichinose in The Piano Forest, Minami in Jewelpet, Katherine Turner in King of Thorn, Sherazade in Cobra The Animation: Time Drive, and Geene in Hatarakids My Ham Gumi. She has also voiced characters in long-running series such as Detective Conan, where she took on roles like Sonoko Suzuki, and Digimon Fusion, as Nene Amano. In addition to anime, her voice work extends to live-action dubbing for television series, with credits including Serena Waterford in The Handmaid's Tale and Dr. Caitlin Snow in The Flash.

In addition to her performance work, Marie Diot has also contributed to the French localization of animated projects as a voice director. Her directing credits include the dubbing for several Detective Conan films and the series L'Âge du Verseau and La Chorale.