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