Marc Diraison is an American voice actor, ADR director, and script writer known for his extensive work in English dubs of anime and other animated series. He was born on February 7, 1975, in San Rafael, California. Diraison began his voice acting career in New York City in the early 2000s, working with studios such as 4Kids Entertainment, NYAV Post, and DuArt Film and Video. In 2013, he relocated to Los Angeles, where he has continued to work in voiceover for animation and video games.

Diraison is perhaps best known for his long-running role as the protagonist Guts in the English adaptations of the Berserk franchise, including the 1997 anime series and the 2012-2013 movie trilogy. Another significant early role was providing the voice of Roronoa Zoro in the 4Kids Entertainment dub of the popular series One Piece.

His filmography includes a wide array of characters across numerous series, many of which were specified by the user. He voiced Zeon Zum Deikun in the Mobile Suit Gundam: The Origin: Advent of the Red Comet series, Bois in The Weathering Continent film, and Dr. Leo Shishioh in GaoGaiGar: King of the Braves. In the series Shrine of the Morning Mist, he voiced both Masashi Kusugi and Michimune Ayatachi. He also provided the voice for Pochi Rickman in the film Welcome to the Space Show, Inspector Kenji Murasame in the Giant Robo OVA, and Hatsugoro, also known as Totoya Hokkei, in the film Miss Hokusai.

Beyond these roles, Diraison has portrayed many other notable characters in major anime franchises. These include Tokiomi Tohsaka in Fate/Zero, Akihiko Kayaba in Sword Art Online, Ging Freecss in Hunter x Hunter (2011 series), Wilhelm van Astrea in Re:Zero − Starting Life in Another World, and Kalin Kessler in Yu-Gi-Oh! 5Ds. He has also voiced characters in popular films such as Taki's father in Your Name. and Mr. Takeuchi in A Silent Voice.

In addition to his on-screen acting, Marc Diraison has frequently contributed behind the scenes as an ADR (Automated Dialogue Replacement) director and script writer for numerous anime dubs. He often collaborated with fellow voice actor and director Michael Sinterniklaas on these projects, serving as a voice director and script adapter for series like Kurokami: The Animation, Let's Go Tamagotchi!, the Slayers Revolution and Evolution-R series, and the film Welcome to the Space Show. His work has made him a well-regarded figure in the industry for his versatile vocal performances, often characterized by a deep and commanding baritone.