David Michael Graham (born July 11, 1925) was an English actor. He voiced the Daleks in Doctor Who, Gordon Tracy, Brains, Aloysius Parker and Kyrano in Thunderbirds, and Grandpa Pig in Peppa Pig. Born in London on 11 July 1925. His sister had married a G.I. and had moved to the United States, and his uncle had run away there, so he became an actor after leaving his Orthodox Jewish household. He trained in New York City at the Neighbourhood Playhouse School of the Theatre with Sanford Meisner, following service in the Royal Air Force as a radar mechanic.

Graham's first breakout role before returning to England was Givola in The Resistible Rise of Arturo Ui, alongside Leonard Rossiter. While playing characters in the TV series Private Investigator in 1958, Graham met writer and producer Gerry Anderson, who was planning his first puppet productions. Graham mentioned to him that he could pull off accents well. His second voiceover role in Four Feather Falls was Grandpa Twink, whom he based on Walter Brennan. He subsequently voiced Dr. Beaker, Zarin and Mitch the Monkey in Supercar, Mat Matic and Lieutenant Ninety in Fireball XL5 and various guest characters in Stingray. Graham also played Johnny in Crossroads to Crime, a live-action film Anderson directed.