Otto Karl Robert Wernicke (30 September 1893, Osterode am Harz – 7 November 1965) was a German actor. He was best known for his role as police inspector Karl Lohmann in the two Fritz Lang films M and The Testament of Dr. Mabuse. He was the first actor to portray Captain Smith in the first "official" Titanic film. Wernicke was married to a Jewish woman. Only due to a special permit and substantial donation to the Nazi Party was he allowed to continue his work in Nazi Germany. He appeared in the 1944–1945 propaganda epic Kolberg.