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 Anxiety disorders are a cluster of mental disorders characterized by significant and uncontrollable feelings of anxiety and fear such that a person's social, occupational, and personal function are significantly impaired. Anxiety may cause physi ...

, different forms of abnormal and pathological fear and anxiety :*

Conversion disorder Conversion disorder (CD), or functional neurologic symptom disorder, is a diagnostic category used in some psychiatric classification systems. It is sometimes applied to patients who present with neurological symptoms, such as numbness, blindness ...

, 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 Obsessive–compulsive personality disorder (OCPD) is a cluster C personality disorder marked by an excessive need for orderliness and neatness. Symptoms are usually present by the time a person reaches adulthood, and are visible in a variety o ...

, 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 Civil disorder, also known as civil disturbance, civil unrest, or social unrest is a situation arising from a mass act of civil disobedience (such as a demonstration, riot, strike, or unlawful assembly) in which law enforcement has difficulty ...

, 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'' (2009 film), a Chinese documentary * ''Disorder'' (2015 film), a French film

Music

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

Mail order

* Dis-order, the mail order service of Displeased Records