Guy Chapellier is a French actor, born on March 15, 1946, who has built a substantial career primarily in the field of dubbing for French-language versions of films and television series. His extensive work covers live-action dubbing, animation, video games, and narration. As a specific example from his animation portfolio, he provides the French voice for the character Goto in the film Patlabor 2: The Movie.

Chapellier began his career in theatre before moving into on-screen acting roles in the 1970s, appearing in French television series such as Commissaire Moulin. He gradually shifted his focus to dubbing, where he became a prolific and regular voice for numerous American actors in the French market. He is recognized as the recurring French voice for performers including Scott Bakula, William Fichtner, Eric Roberts, Nicholas Lea, and Brett Cullen, and was among the first French voices for Jackie Chan, James Woods, and Kevin Kline.

His voice work is prominent in several major franchises. In live-action dubbing, he is particularly known for being the French voice of the car KITT in the series Knight Rider (K 2000) and the narrator in The Twilight Zone (La Quatrième Dimension). He has also voiced characters in the Star Wars universe, including Wilhuff Tarkin in the animated series Star Wars: The Clone Wars, and has contributed to the French dubs of the Mass Effect and Batman: Arkham video game series.

Within the field of animation, Chapellier has held several notable roles. He became the second French voice of the Disney character Hades across various media and voiced the character Scar in The Lion King II: Simba's Pride. He provided the voice for the Admiral in the Pixar film Finding Nemo. Since 2005, he has been the French voice for both Roger the alien and Klaus the goldfish in the long-running adult animated series American Dad!. His work in anime includes providing temporary replacement voices for the main character Seiya in several episodes of Saint Seiya (known in French as Les Chevaliers du Zodiaque) and voicing other characters such as Ōko, Dio the Fly, and Dante of Cerberus in the same series. He also voiced Tenzin in The Legend of Korra and Jor-El in Superman: The Animated Series. Further animation roles include Justin in The Secret of NIMH (Brisby et le Secret de NIMH) and the character Freddy in Bee Movie.

Beyond performance, Chapellier has worked extensively as a narrator for documentaries, audiobooks, and theme park attractions, including the Twilight Zone Tower of Terror at Disneyland Paris. His date of birth is March 15, 1946. His name is sometimes misspelled as Guy Chapelier.