Mariko Suzuki is a Japanese voice actress and narrator born on January 30, 1970, in Tokyo, Japan. She is affiliated with Aoni Production, a major talent management agency, having graduated from its affiliated training school, Aoni Juku, as part of the 14th graduating class. Her career in the voice acting industry began in 1994.

Suzuki's voice is often characterized as deep and well-suited for portraying sultry or mature female characters. Her body of work spans animation, original video animations (OVA), and video games.

Among her most prominent and long-running roles is the character KOS-MOS from the Xenosaga series of role-playing games and its anime adaptation, Xenosaga: The Animation. Another significant video game role is the female warrior Nōhime in Koei Tecmo's Samurai Warriors series, a part she has played consistently across multiple installments and related crossover titles like Warriors Orochi. She has also provided voices for other game franchises, including Irene Lew in the Ninja Gaiden series, Elizabeth Conway in Time Crisis 4, and characters in the Project X Zone crossover games.

In anime and OVA, Suzuki has taken on a variety of roles. She is known for playing Amane Kaunaq, a character who first appeared in the Tenchi Muyo! spin-off series Tenchi Muyo! GXP. She reprised this role for the fourth and fifth seasons of the core Tenchi Muyo! Ryo Ohki OVA series, which were released starting in 2016. Her other notable roles include Chigusa Iino in the Green Green anime and its related OVAs, including Green Green Thirteen: Erolutions. She has also appeared in series such as Air Master, Mythical Detective Loki Ragnarok, and Yumeria.

Throughout her career, Suzuki has demonstrated recurring collaborations with specific franchises and production teams. Beyond her long-standing association with the Tenchi Muyo! universe and the Samurai Warriors games, she has frequently voiced characters in projects related to the Super Robot Wars franchise, such as Echidna Iisaki. Her work is also characterized by reprising roles across different media, as seen with KOS-MOS appearing in multiple games and an anime, and Amane Kaunaq appearing in different series within the same franchise. Her early career included the role of Honoka Sawatari in the multimedia project Sentimental Journey, where she was noted as the eldest member of its voice acting unit.