- SAMe
- Schizoaffective disorder
- Schizoid personality disorder
- Schizophrenia
- Schizophreniform disorder
- Schizotypal personality disorder
- Seasonal affective disorder
- Sedatives and related disorders
- Seizures
- Selective mutism
- Self-control strategies
- Self-help groups
- Separation anxiety disorder
- Sertraline
- Sexual aversion disorder
- Sexual dysfunctions
- Sexual masochism
- Sexual sadism
- Sexual Violence Risk-20
- Shared psychotic disorder
- Single photon emission computed tomography
- Sleep disorders
- Sleep terror disorder
- Sleepwalking disorder
- Social phobia
- Social skills training
- Social workers
- Somatization and somatoform disorders
- Somatization disorder
- Specific phobias
