Joël Mulachs is a Spanish voice actress born in Barcelona on February 17, 1970. She began her professional career in dubbing in 1990. Mulachs trained as a dubbing actress in Barcelona in the early 1990s and later expanded her acting education in New York City, completing programs at the Gately Poole Acting Studio and the Actor's Studio.

She has built a career spanning over thirty years, providing voices for more than a thousand films and television series. In addition to her dubbing work, Mulachs is an active voice-over artist for advertising campaigns and has been a staff announcer for the Spanish television network La Sexta since its inception in 2005. She has also shared her expertise as a university instructor, teaching on a postgraduate program in voice-over and dubbing.

Mulachs is highly regarded for her work in anime and animation. She is the voice of Conan Edogawa in the Catalan-language dub of the long-running series Detective Conan (also known as Case Closed). This role extends to numerous films in the franchise, including Detective Conan: The Bride of Halloween, Detective Conan: The Scarlet Bullet, Case Closed: The Fist of Blue Sapphire, Detective Conan - Episode One: The Great Detective Turned Small, and the crossover film Lupin III vs. Detective Conan The Movie. In Catalan dubs, she also voiced Son Gohan in Dragon Ball Z and Sango in Inuyasha.

Her prominent anime roles in Spanish include Hange Zoë in the series Attack on Titan and its related films such as Attack on Titan: The Roar of Awakening and the parody series Attack on Titan: Junior High. She is the Spanish voice of Rei Ayanami for the Rebuild of Evangelion film series, which includes Evangelion: 3.0+1.0: Thrice Upon A Time. Other notable credits include Cactus in the anime Demashitaa! Powerpuff Girls Z, Demonika in the Spanish anime series Virtual Hero, and roles in feature films like Summer Days with Coo.

Beyond animation, Mulachs is widely recognized as the regular Spanish dubbing voice for several major international actresses, including Scarlett Johansson for over fifteen years, as well as Rachel McAdams, Kerry Washington, Emily Blunt, and Mélanie Laurent. Her work in live-action dubbing includes characters such as Black Widow in the Avengers saga and Mia Toretto in the Fast & Furious franchise. In the realm of video games, she has lent her voice to prominent characters like Kassandra in Assassin's Creed Odyssey and Riju in The Legend of Zelda: Breath of the Wild.

In 2020, Mulachs received the ReTAKE National Dubbing Award for Best Film Dubbing Actress for her performance as Scarlett Johansson in the film Marriage Story.