Maria Rosa Guillén is a Spanish voice actor known for her extensive work in dubbing anime into Spanish. She has been active in the dubbing industry for several decades, providing voices for a wide range of characters in both animated films and television series. Her career encompasses roles from classic anime to more recent productions, reflecting her versatility and long-standing presence in the field.

Among her notable voice roles, she is recognized for portraying Sachiko Ogasawara in the Maria Watches Over Us series, a character she voiced across multiple seasons. In the Puella Magi Madoka Magica series, she took on the roles of Junko Kaname and Kazuko Saotome. She also voiced Akane Kimidori in various Dr. Slump & Arale-chan productions, including Dr. Slump & Arale-chan Ncha! Penguin Mura wa Hare no chi Hare and Dr. Slump & Arale-chan: Hoyoyo! The Secret of Nanaba Castle. Other significant roles include Tom Sawyer in The Adventures of Tom Sawyer, Emeraldas in Queen Emeraldas, and Towa Sasakura in The Sky Crawlers. In the film Colorful, she voiced Makoto's Mother, and in Love Lessons, she played both Natsumi Sakuragi and Sanato Sakuragi.

Guillén has also contributed to series such as Ai City as Kate, Saint Young Men as Ryota, Mazinger Edition Z: The Impact! as Tsubasa Nishikiori, and Crayon Shin-chan: Unkokusai no Yabō as Fubukimaru Kasuga. Her work extends to Project Blue Earth SOS as Emily, Comic Party Special as Reiko Haga, Girl's High as Kyoko Himeji, Words Worth as Sharon, Coyote Ragtime Show as Madame Marciano, Moeyo Ken as Yuuko Kondou, Final Approach as Shizuka Masuda, and The Dog of Flanders as Alois Cogez. In Kishin Corps, she voiced both Bareiho and Eva Braun, and in Konchū Monogatari Mitsubachi Hutch - Yūki no Melody, she was Vespa reina. Additionally, she appeared in Make Up! Sailor Guardians as Aya and in Maison Ikkoku: Kanketsuhen as Hanae Ichinose.

Throughout her career, Guillén has demonstrated recurring collaborations with Spanish dubbing studios, often working on multiple projects within the same production teams. Her ability to take on diverse roles, from young characters like Tom Sawyer to more mature figures like Sachiko Ogasawara, highlights her range as a voice actor. Her involvement in both film and television dubs underscores her adaptability and commitment to the craft. While specific awards are not documented, her extensive filmography and the variety of characters she has portrayed establish her as a notable figure in the world of Spanish anime dubbing.