Harry O, sometimes spelled Harry-O, is an American crime drama series that aired for two seasons on ABC from 1974 to 1976. The series starred David Janssen and was executive produced by Jerry Thorpe. Harry O followed the broadcast of two pilot films: Such Dust as Dreams Are Made On (airing March 11, 1973) and then the second (with noticeable retooling), Smile Jenny, You're Dead (airing February 3, 1974), both starring Janssen.