Circus of Fear, also Scotland Yard auf heißer Spur, also Circus of Terror) is a 1966 Anglo-German international co-production thriller film starring Christopher Lee, Suzy Kendall, Leo Genn and Cecil Parker. The U.S. title was Psycho-Circus. It was based on the novel Again the Three Just Men by Edgar Wallace (1928).

Leopold John Genn was an English actor and barrister. Distinguished by his relaxed charm and smooth, "black velvet" voice, he had a lengthy career in theatre, film, television, and radio; often playing aristocratic or gentlemanly, sophisticate roles.