- Sadomasochism
- Schizoaffective disorder
- Schizoid personality disorder
- Schizophrenia
- Schizophreniform disorder
- Schizotypal personality disorder
- Seasonal affective disorder
- Sedative-, hypnotic-, or anxiolytic-related disorder
- Selective mutism
- Separation anxiety disorder
- Severe mental retardation
- Shared psychotic disorder
- Sleep disorder
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- Sleep terror disorder
- Sleepwalking disorder
- Social anxiety disorder
- Social phobia
- Somatization disorder
- Somatoform disorder
- Specific phobia
- Stendhal syndrome
- Stereotypic movement disorder
- Stuttering
- Substance-related disorder
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