Udo Kierspe, known professionally as Udo Kier, is a German actor. Known primarily as a character actor, Kier has appeared in more than 220 films in both leading and supporting roles throughout Europe and the Americas. He has collaborated with acclaimed filmmakers such as Lars von Trier, Gus Van Sant, Werner Herzog, Rainer Werner Fassbinder, Walerian Borowczyk, Kleber Mendonça Filho, Dario Argento, Charles Matton, Guy Maddin, Alexander Payne, and Paul Morrissey.

Lars von Trier is a Danish film director and screenwriter.