Luis Grau is a Spanish voice actor known for his extensive work in dubbing anime and live-action productions into Spanish, primarily for audiences in Spain. He is professionally active and possesses a medium-register voice, which has allowed him to portray a wide array of characters, from cunning antagonists to supportive father figures.

Grau's career is heavily focused on animation, with a significant number of credits in popular anime series and films. He is particularly recognized for his contributions to the Spanish and Catalan dubs of long-running and internationally renowned franchises. One of his most prominent and recurring roles is that of Gin, a high-ranking operative in the Black Organization, in the Detective Conan series. He has voiced this character in various specials and films, including Detective Conan - Episode One: The Great Detective Turned Small and multiple movies such as The Raven Chaser, The Darkest Nightmare, and The Bride of Halloween.

Another major franchise in his filmography is Death Note, where he provided the voice for Kanzou Mogi, a member of the task force assisting L. He performed this role across several adaptations, including the original anime television series, the live-action films Death Note and Death Note: The Last Name, and the special Death Note Relight - Visions of a God. His versatility is further showcased in The Legend of the Dog Warriors: The Hakkenden, where he voiced multiple characters, including Dosetsu Inuyama and Kobungo Inuta. He also took on the role of the kindly Professor Utonium in the anime spin-off Demashitaa! Powerpuff Girls Z.

Beyond these titles, Grau's body of work demonstrates a consistent presence in the dubbing of major anime. His credits include voicing Ken Masters in Street Fighter Alpha and its sequel, various characters in the 2001 Shaman King series, Magno in Pokémon Generations, and Nogo in Glitter Force. He has also contributed to dubs for films such as Napping Princess and The Case of Hana & Alice. While primarily associated with animation, his work also extends to live-action dubbing, as evidenced by his participation in the Spanish versions of films like the live-action Death Note movies and Transformers: Age of Extinction.