- chemoreceptor
- chi-square distribution
- chi-square test
- Chicago school
- child psychology
- child psychosis
- childhood
- Children's Apperception Test
- choice reaction time
- choleric temperament
- chromatic adaptation
- chromatic color
- chromatic error
- chromaticity
- chromaticity diagram
- chromosome
- chronic alcoholism
- chronic schizophrenia
- chronological age, CA
- chunk
- cingulate gyrus
- circadian rhythm
- circular response
- clang color
- Clarker phenomenon
- classical conditioning
- classical test theory, CTT
- classification
- classroom discipline
- classroom dynamics
- classroom psychological environment
- client
- client-centered therapy
- climacteric syndrome
- clinical method
- clinical psychology
- clinical test
- closed motor skill
- closed-loop control
- cluster analysis
- cochlea
- cochlear nucleus
- coding
- coding of controls
- coding strategy
- coefficient of correlation
- coefficient of variation
- cognition
- cognition-assimilation theory
- cognition-discovery theory