- Sigmund Freud
- Signal Detection Theory
- Significance Level
- Sir Francis Galton
- Sleep
- Sleep Disorders
- Smell
- Social Competence
- Social Influence
- Social Learning Theory
- Social Perception
- Social Psychology
- Socialization
- Sociobiology
- Somnambulism
- Special Education
- Specific Language Impairment (SLI)
- Speech Perception
- Speech-Language Pathology
- Split-Brain Technique
- Sports Psychology
- Standard Progressive Matrices (SPM)
- Standardized Test
- Stanford-Binet Intelligence Scales
- Stanley Milgram
- Statistics in Psychology
- Stereotype
- Stimulant Drugs
- Strange Situation
- Stranger Anxiety
