- aristocracy of labour
- arithmetic mean
- arms control
- Aron, Raymond
- artefacts, statistical and methodological
- asceticism, this-worldly
- ascribed status
- ascription
- Asiatic mode of production
- assimilation
- association
- association coefficients
- associational democracy
- Aston School (of organization theory)
- asymmetrical causal processes
- asymmetry hypothesis
- atomism
- attitudes
- attitudinal consistency
- attribution theory
- authenticity
- authoritarian
- authoritarian personality
- authoritarian populism
- authoritative power
- authority
- autobiography
- autocracy
- automation
- average
