Disorder may refer to randomness, a lack of intelligible pattern, or:

Healthcare Disorder (medicine), a functional abnormality or disturbance Mental disorder or psychological disorder, a psychological pattern associated with distress or disability that occurs in a person and is not a part of normal development or culture: Anxiety disorder, different forms of abnormal and pathological fear and anxiety Attention-deficit hyperactivity disorder Autism spectrum disorder Conversion disorder, neurological symptoms such as numbness, blindness, paralysis, or fits, where no neurological explanation is possible Obsessive–compulsive disorder, an anxiety disorder characterized by repetitive behaviors aimed at reducing anxiety Obsessive–compulsive personality disorder, obsession with perfection, rules, and organization Personality disorder, an enduring pattern of inner experience and behavior that deviates markedly from the expectations of the culture of the person who exhibits it

Law enforcement Civil disorder, one or more forms of disturbance caused by a group of people Lawlessness, a lack of laws or law enforcement

Science Crystallographic disorder, disordered atom locations in crystals Order and disorder

Arts, entertainment, and media Films Disorder (1962 film), a film by Franco Brusati Disorder (2006 film), a psychological thriller by Jack Thomas Smith Disorder (2009 film), a Chinese documentary Disorder (2015 film), a French film

Music "Disorder (song)", a song by Joy Division from the 1979 album Unknown Pleasures Disorder (EP), an EP by Front Line Assembly Disorder (band), a Bristol-based hardcore punk band Disorder (album), an album by The Gazette

Other uses Dis-order, the mail order service of Displeased Records

See also Chaos (disambiguation) Order (disambiguation)