Fabien Jacquelin is a French actor primarily known for his extensive work in dubbing. He began his career in the theater, taking acting classes with Jean Périmony and then with Jean-Laurent Cochet starting at the age of twenty. For several years following his training, he not only performed in plays but also served as an assistant director and stage manager for Cochet on numerous productions, including Les Fausses Confidences, La Parisienne, and Chat en poche. A theater colleague, Jean-Pierre Leroux, helped steer him towards the field of dubbing, where he has since become a prominent voice.

In the realm of animation, Jacquelin is recognized for his work in several anime series and films. He is the regular French voice for the character Sôga in the Hokuto no Ken franchise. This includes the films Shin Kyūseishu Densetsu Hokuto no Ken Raō-den Jun'ai no Shō, released in France as Hokuto No Ken 1: L'ère de Raoh, and Shin Kyūseishu Densetsu Hokuto no Ken Yuria den, as well as the original video animations La Légende de Julia and La Légende de Toki. Beyond this role, his anime credits include voicing Guts in the series Berserk, Ken in the Street Fighter Alpha OVA, and Koshiro in Basilisk. He has also provided voices for numerous other animated projects, such as the character Number 6 in the film 9, additional voices in various Disney and Pixar films like The Incredibles and Up, and roles in series like The Little Prince and Transformers: EarthSpark.

Jacquelin's dubbing career, however, extends well beyond animation. He is the regular French voice for several live-action actors, including Mark Sheppard, Scott Adkins, Andrew Rothenberg, and Zak Santiago. Among his notable film dubbing roles are General Pryde for Richard E. Grant in Star Wars: Episode IX – The Rise of Skywalker, Jasper Sitwell for Maximiliano Hernández in the Marvel Cinematic Universe, and Major Jamie Stewart for Benedict Cumberbatch in War Horse. His voice is also prominent in video games, where he has voiced Jack Cooper in Titanfall 2, Sogen in Ghost of Tsushima, the Necromancer in Diablo IV, Ghostface in Call of Duty games, and Raeb and Surt in God of War: Ragnarök. Additionally, he has narrated numerous documentaries for French television channels such as France 5 and Arte.