Karl Zéro is the stage name of Marc Tellenne (born August 6, 1961 in Aix-les-Bains, Savoie), is a French writer, actor and filmmaker. Zéro is also a political talk show host/personality (Le Vrai Journal) who has recorded albums of pop standards of the 1940s and 1950s.

Karl Zéro is the youngest son of Gui Tellenne, a civil servant and poet, and Annick Tellenne, an author and talk-show host. He has three brothers: Éric, a writer under the name of Raoul Rabut, Bruno (aka Basile de Koch) and Olivier, a business executive. In the late 1970s Éric, Bruno and Marc founded the satirical comedy troupe Groupe d'Intervention culturelle Jalons.