Eduardo Díez is a Spanish actor of voiceover and dubbing, primarily known for his work in the Spanish-language adaptations of anime and animated series. Based in Barcelona, he has been active in the dubbing profession since at least 1995 and has built a substantial career lending his voice to a wide array of characters in films, television series, and video games.

His entry into the world of dubbing began in 1993 when he enrolled in a dubbing course in Zaragoza, a decision sparked by a newspaper advertisement. He started dubbing professionally in Zaragoza before moving to Barcelona in 2001, where he has since become an established figure in the industry. Beyond his work as an actor, Díez has also served as a dubbing director at several notable Barcelona studios, including Sonilab Studios, Seimar, and Media Arts Studio.

Díez has a significant body of work within the anime genre, with his roles often spanning different character types. He is the Spanish voice for Bondrewd, a complex and central antagonist in the Made in Abyss franchise, voicing the character in the television series, the film Dawn of the Deep Soul, and its sequel. In the political space opera The Legend of the Galactic Heroes: Die Neue These, he provides the voice for the character Alex Cazerne. He also appears in the same series as the voice of several other characters, including Ansbach and Ernest Mecklinger.

His other prominent anime roles include the character Kanji Kageyama in the film Twittering Birds Never Fly: The Clouds Gather. He has also been involved in long-running and classic series, such as providing the voice of Tatsunosuke Sakonji in the beloved comedy Kochira Katsushika-ku Kamearikouen-mae Hashutsujo (often shortened to Kochikame). For fans of the JoJo's Bizarre Adventure series, Díez has voiced multiple characters across its various parts, including Tarkus in the Stardust Crusaders arc, as well as Captain Tennille, Anubis, and Daniel J. D'Arby.

His versatility is further demonstrated by his roles as Kiba, the lone wolf protagonist in Wolf's Rain, and as Takumi Fujiwara, the lead character in the first series of the street racing anime Initial D and its third film. He is also the voice of Sha Gojyo in both the Saiyuki Reload television series and its film, Saiyuki: Requiem. His credits extend to films such as The Princess and the Pilot, where he voiced Takeo Chijiwa.