Boris Sanz is a Spanish voice actor primarily known for his extensive work in dubbing foreign-language animation and live-action content into Spanish, particularly for the Spanish market. His career encompasses a wide range of roles in anime series, films, and video game adaptations.

Sanz has lent his voice to numerous prominent anime franchises. He is notably the Spanish voice of Sakonji Urokodaki, the former Water Hashira and trainer of the protagonist in the series Demon Slayer: Kimetsu no Yaiba. In the global phenomenon Attack on Titan, he has performed multiple roles across different installments of the franchise. These include Artur Browse, the father of Sasha Blouse, in Attack on Titan The Final Season, as well as Gunther Schultz in the chibi-style spin-off Attack on Titan: Junior High. He also voiced Desmond Rutaganda in the Psycho-Pass film and Guillermo García in the Psycho-Pass: Sinners of the System film series.

His film work is equally prolific, particularly within the realm of animated features. Sanz voiced Vulcan Haestus, the colonel of the Freeze Force, in the Studio Trigger film Promare and its accompanying short, Promare: Lio-hen. He also played the Bilusaludo technical officer Mulu-Elu Galu-Gu in the Godzilla anime film trilogy, which includes Godzilla: Planet of the Monsters, Godzilla: City on the Edge of Battle, and Godzilla: The Planet Eater. Additional notable film roles include Leon Lowe in Case Closed: The Fist of Blue Sapphire, Makoukan in The Deer King, Tatsuo Seno in Giovanni's Island, Seitaro Higuchi in Night is Short, Walk On Girl, and Enzo in Bayonetta: Bloody Fate.

Beyond these major titles, Sanz's dubbing credits demonstrate a broad range across many popular series and films. He has contributed voices to long-running franchises such as One Piece, where his roles include Bolodo in One Piece: Nejimaki Shima no Bōken, Sengoku in multiple films, and Charlotte Oven in One Piece Film Red. His television work includes roles in Fairy Tail, Haikyu!!, Assassination Classroom, One Punch Man, and many others. He has also performed in Valencian-language dubs for titles like Cardcaptor Sakura, Idaten Jump, Igano Kabamaru, and Genki Bakuhatsu Ganbaruger.