Duncan Brannan is an American voice actor born on June 25, 1970, in Fort Worth, Texas. While he has an extensive career voicing characters in mainstream children's entertainment—most notably as the voice of Chuck E. Cheese from 1993 to 2012 and as the voice of Barney the Dinosaur for various projects between 1997 and 2002—he is also widely recognized for his prolific work in English-language dubs of Japanese anime, primarily for Funimation.

Brannan's anime voice acting career spans numerous series and films, demonstrating his versatility across a wide range of characters. He has been a consistent presence in long-running and popular franchises. In the Funimation dub of One Piece, he voices the character Galdino, also known as Mr. 3. His work on the series includes the special One Piece 3D2Y: Overcoming Ace's Death! Luffy's Pledge to His Friends and the film One Piece Stampede. He is also the voice of Saiji Tatemiya in both A Certain Magical Index II and A Certain Magical Index III. His other notable roles include Oda Nobuhiro in the series Kochoki and Dagmyer Mesut in Tenchi Muyo! War on Geminar.

Beyond these specific credits, Brannan has lent his voice to a vast array of other anime series. His filmography includes significant roles and additional voices in Fullmetal Alchemist and Fullmetal Alchemist: Brotherhood, Samurai 7, Attack on Titan, Dragon Ball Z (including films and Kai), Dragon Ball GT, Black Clover, Barakamon, and Last Exile: Fam, The Silver Wing, among many others. His recurring collaborations with Funimation have made him a familiar presence in the English-dubbed anime landscape for decades.