Gregory Dean "Greg" Baldwin is an American actor and voice actor. He is well known for voicing Uncle Iroh in the Nickelodeon animated series Avatar: The Last Airbender and its spin-off The Legend of Korra and Aku in the 5th and final season of Cartoon Network's Samurai Jack (replacing the late Mako Iwamatsu).

For Disney, he voiced Sinub, Casiss, Serapis, and other characters in the Disney XD animated series Star Wars: The Clone Wars. He also voiced Cosmonaut Monkey and other characters in Disney Channel's Brandy & Mr. Whiskers. In addition, he provided various voices for video games such as Kinect: Disneyland Adventures.

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