Nicolas Justamon is a French actor primarily known for his extensive work in voice dubbing for anime and animated series. Born on December 23, 1972, his career spans stage performance, television, and voice direction.

Justamon's foundational training in the performing arts began with comedy courses under Stéphane Hapiot in Bordeaux, followed by studies at the Conservatoire Régional de Limoges and additional singing lessons. His early career was rooted in theatre and music-hall, where he performed as a comedian, singer, and dancer, creating and producing his own shows that toured internationally. He also appeared in live-action French television series such as Famille d'accueil and Louis la Brocante.

His voice acting portfolio is extensive and features prominent roles in the French dubs of numerous anime series. He is recognized for his performances as Vaux in Dorohedoro, Lewis Müller and Salazar in Great Pretender, and Larry Markson in Spriggan. His other notable anime credits include Shadow in Sk8 the Infinity, Dagon in Jujutsu Kaisen (season 2), Fritz in Attack on Titan The Final Season Part 2, Juroimoar in Made in Abyss: The Golden City of the Scorching Sun, Gondo in Overlord IV, Richard Altner in 86, Ketil in the Crunchyroll dub of Vinland Saga (season 2), and roles in Ultraman, Super Crooks, and Transformers: War for Cybertron Trilogy: Siege. Beyond anime, he has voiced characters in animated films such as Harold in Black Fox and provided voices for the feature film Mars Express.

In addition to his work in Japanese animation, Justamon has built a career dubbing live-action series and films. He is known as one of the regular French voices for actors such as Chris Shields, Sean Ringgold, and Michael Cyril Creighton, with his credits including series like Castle, CSI, and Gotham. His voice work also extends to video games, where he voices the champion Pantheon in the French version of League of Legends.

Justamon also works as a voice director, having served as the dubbing director for the French versions of several Netflix series, including the Psycho-Pass: Sinners of the System films.