Robert Matthews is a professional name used by the American voice actor David A. Thomas, who has been active in the industry since the early 1980s. Under this pseudonym, he has contributed voice work to a number of notable animated series, films, and video games.

In anime and animation, Matthews is recognized for his role as the voice of Shirotsugh Lhadatt, the protagonist of the groundbreaking 1987 anime film Royal Space Force: The Wings of Honnêamise. Another significant role credited to Robert Matthews is Grencius Wesley "Gren" March in the acclaimed series Cowboy Bebop. His work in English-dubbed anime also includes voicing the title character in the series Teknoman Blade, an adaptation of Uchū no Kishi Tekkaman Blade. Beyond these credits, his animation voice work includes the character Farmer Don on the series As Told By Ginger.

Beyond animation, the voice actor has an extensive portfolio in video games under his own name, David A. Thomas, with performances that include The Sorrow in Metal Gear Solid 3: Snake Eater and General Thunderbolt Ross in The Incredible Hulk: Ultimate Destruction.