Karl Diedrich Bader is an American actor and comedian. He is best known for his comedy-centered and voice acting-related roles. He has appeared as a series regular in television sitcoms The Drew Carey Show, American Housewife, and Outsourced, along with notable recurring roles in Better Things and Veep. His film credits include The Beverly Hillbillies, Office Space and Napoleon Dynamite. He has also had a prolific voiceover career, playing characters such as Hoss Delgado in The Grim Adventures of Billy & Mandy, Zeta in The Zeta Project, Tank in the film Surf's Up, and provided the voice of Bruce Wayne / Batman in multiple animated films and television series, beginning in 2008 with Batman: The Brave and the Bold.

Edward Lawrence Bader was an American politician who served as Mayor of Atlantic City, New Jersey for much of the Roaring Twenties, when the city was arguably at the peak of its popularity as a vacation spot. Bader was known for his contributions to the construction, athletics and aviation of Atlantic City.