• German: Psycho (slang), Psychopath
• Portuguese: psicopata & , psicótico , louco , doido , insano
• Spanish: psicópata

• German: Verrückte m|f
• Portuguese: psicopata & , psicótico

• ttbc Interlingua: psychopathe, psychotic

Psycho is slang for a person who is either psychopathic or psychotic. The term is often considered mildly offensive or derogatory. The word is a noun. Used in a sentence like this, 'Steve sure is a psycho'.

Films

• Psycho (1960 film), directed by Alfred Hitchcock
• Psycho (1998 film), a remake directed by Gus Van Sant
• Psycho II, a 1983 sequel to the first film (unrelated to the novel Psycho II)
• Psycho III, a 1986 sequel to the first film
• Psycho IV: The Beginning, a 1990 prequel to the first film

Novels

• Psycho (novel), a 1959 novel by Robert Bloch
• Psycho II (novel), a 1982 novel by Bloch
• Psycho Barlas Karahocaoglu (novel), a 1991 novel by Sedef Işım
• Psycho House

Music

• "Psycho", a song by country and western songwriter Leon Payne. This is a tongue-in-cheek storyline song loosely based on the Norman Bates character
• "Psycho (song)", a song by Puddle of Mudd from their album Famous
• "Psycho", a song by System of a Down from the album Toxicity
• "Psycho", a 1965 song by The Sonics
• "Psycho", a song by Infected Mushroom from The Gathering
• Psycho, an album by Element of Crime
• "Psycho Killer", a song by Talking Heads
• "Psycho Girl", a song by Busted
• "PSYCHO", an 80's punk/thrash/noise/crust/grind band from Cambridge MA

Sports figures

• Stuart Pearce, an English football player and manager nicknamed "Psycho"
• Steve Lyons (baseball), a utility baseball player nicknamed "Psycho"
• Peter Ebdon, English snooker cueist nicknamed "Psycho"

Others

• Psycho, a horror comic magazine from Skywald Publications
• Psycho, an automaton invented and displayed on stage by the Victorian illusionist John Nevil Maskelyne
• Psycho (company), a Japanese visual novel studio
• Psychiatrist (game), also known as Psycho, a party game
• Psyco, a just-in-time compiler for the Python programming language

abnormal, bereft of reason, brainsick, catatoniac, certifiable case, crackbrained, cracked, crazed, crazy, daft, deluded, demented, deprived of reason, deranged, disoriented, distraught, flighty, hallucinated, insane, irrational, loco, lunatic, mad, maddened, manic, manic-depressive, mazed, mental, mental case, mentally deficient, meshuggah, moon-struck, non compos, non compos mentis, not all there, not right, odd, of unsound mind, off, paranoiac, paranoid, psychopath, psychopathic case, psychopathic personality, psychotic, queer, reasonless, schiz, schizo, schizoid, schizophrenic, schizy, senseless, sick, stark-mad, stark-staring mad, strange, tetched, touched, unbalanced, unhinged, unsane, unsettled, unsound, wandering, witless