Ardwight Chamberlain is an American voice actor and screenwriter recognized for his contributions to English-dubbed anime and animated series. Born on February 16, 1957, in San Mateo, California, and based in Los Angeles, he has also been credited professionally under names such as R.D. Chamberlain and R. Dwight. His career encompasses voice work for animation, live-action television, and video games, as well as writing for several animated programs.

Chamberlain's voice acting in anime includes a variety of roles, particularly in English dubs produced during the 1980s and 1990s. He is known for providing the voice of Jean in the Streamline Pictures dub of Nadia: The Secret of Blue Water and Goemon Ishikawa XIII in the Streamline dub of Lupin III: The Mystery of Mamo. His other anime credits include roles in Robotech II: The Sentinels as Rem, Barefoot Gen, Casshan: Robot Hunter, and Doomed Megalopolis. In addition to these, he voiced John Brooke in the anime adaptation Tales of Little Women and Trap Boots in the series Fortune Quest, demonstrating the breadth of his work in the genre.

Beyond anime, Chamberlain is perhaps most widely recognized for his portrayal of the enigmatic Vorlon Ambassador Kosh in the acclaimed science-fiction television series Babylon 5. He provided the voice for both Kosh and Ulkesh across twenty episodes from 1994 to 1997. His voice work also extends to video games, such as his role as Nicolas Conrad in the English version of Shadow Hearts: Covenant.

In addition to performing, Chamberlain has worked extensively as a screenwriter in animation. He wrote numerous episodes for the English adaptation of the popular anime series Digimon: Digital Monsters. His other writing credits include work on the Robotech franchise, Z-Squad, and Teknoman. He has also appeared as a contestant on the game show Jeopardy!.