Carlos Sianes is a Spanish voice actor known for his work in anime dubbing for the Spanish market. His career is primarily documented through his extensive list of credited roles in various anime series and films, where he provides voices for the Spanish-language adaptations.

Sianes has portrayed a wide array of characters across many popular anime franchises. He is the voice of Yuya Kazami in the Detective Conan franchise, including the television series Zero's Tea Time and the film Case Closed: Zero the Enforcer. In the My Hero Academia series, he voices the character Mezo Shoji, a role he has reprised in the films My Hero Academia: Two Heroes and My Hero Academia the Movie -Heroes: Rising-. He also played Kyosuke Isazu in the original net animation A.I.C.O. -Incarnation- and Boma in the series Heat Guy J. His other notable roles include Finral Roulacase in Black Clover, Brandon Heat in Gungrave, and Alexander Andersen in Hellsing Ultimate.

His voice work is not limited to television series, as he has also contributed to video game dubbing. For instance, he voiced Nathan's Father and other characters such as Origenio and Enma Ancestral in the Spanish version of the video game Yo-kai Watch 3. The consistent reference to the "Spain dub" or "Spanish version" across his credits confirms that his body of work is primarily for audiences in Spain.