Udo Kierspe (October 14, 1944 – November 23, 2025), known professionally as Udo Kier, was a German actor. Known primarily as a cult character actor who portrayed eccentric and deviant figures, he appeared in more than 220 films in both leading and supporting roles throughout Europe and the Americas. He collaborated with acclaimed filmmakers such as Lars von Trier, Gus Van Sant, Werner Herzog, Rainer Werner Fassbinder, Walerian Borowczyk, Kleber Mendonça Filho, Dario Argento, Tom Shadyac, Charles Matton, Guy Maddin, Alexander Payne, and Paul Morrissey.