Robert DeWayne Papenbrook (September 18, 1955 – March 17, 2006) was an American voice actor.

Fellow voice actors often nicknamed him "Pappy". He was very well known in the worlds of anime and video game voice-overs for his voice acting of "gruff" characters. However, he was especially well known in his various live action voice-overs which, most notably, included the Power Rangers franchise. He was discovered by filmmakers Steven Spielberg and George Lucas, which got him his very first voice acting role in the hit film Raiders of the Lost Ark as the voices of all the Hovito natives who pursue Indiana Jones in the beginning of the film. His best-known roles included the voices of Rito Revolto in Mighty Morphin Power Rangers and Power Rangers Zeo, Shadowborg in Big Bad Beetleborgs, Scorpix in Beetleborgs Metallix and Deviot in Power Rangers: Lost Galaxy.