PS, P.S., ps, and other variants may refer to:
Psychology is the science of behavior and mind, embracing all aspects of conscious and unconscious experience as well as thought.
Psoriasis is a long-lasting autoimmune disease which is characterized by patches of abnormal skin. These skin patches are typically red, itchy, and scaly.
Psychopathy (/saɪˈkɒpəθi/), sometimes considered synonymous with sociopathy (/soʊsiˈɒpəθi/), is traditionally defined as a personality disorder characterized by persistent antisocial behavior, impaired empathy and remorse, and bold, disinhibited, egotistical traits.
Psychosis is an abnormal condition of the mind that involves a "loss of contact with reality". People experiencing psychosis may exhibit personality changes and thought disorder.
Pseudoscience consists of claims, beliefs, or practices presented as being plausible scientifically, but which are not justifiable by the scientific method.
Pseudoephedrine (/ˌsjuːdoʊ.ᵻˈfɛdrɪn/ or /ˌsjuːdoʊˈɛfᵻdriːn/; PSE) is a sympathomimetic drug of the phenethylamine and amphetamine chemical classes.
Psychoanalysis is a set of theories and therapeutic techniques related to the study of the unconscious mind, which together form a method of treatment for mental-health disorders.
Psycho is a 1960 American psychological horror film directed and produced by Alfred Hitchcock, and written by Joseph Stefano, starring Anthony Perkins, Janet Leigh, John Gavin, Vera Miles and Martin Balsam, and was based on the 1959 novel of the same name by Robert Bloch.
The Book of Psalms (Hebrew: תְּהִלִּים or תהילים, Tehillim, "praises"), commonly referred to simply as Psalms or "the Psalms", is the first book of the Ketuvim ("Writings"), the third section of the Hebrew Bible, and a book of the Christian Old Testament.