- altruism
- altruistic suicide
- ambivalence
- amnesia, retrograde
- amoral familism
- amplification of deviance
- analysis of variance
- analytic induction
- analytical Marxism
- anarchism
- anarchy, epistemological
- ancestry
- androgyny
- animism
- Annales School
- anomic suicide
- anomie
- anthropology
- anthropomorphism
- anti-naturalism
- anti-psychiatry
- anti-urbanism
- anticipatory socialization
- antinomianism
- apartheid
- applied sociology
- appropriate technologies
- aptitude
- Ardrey, Robert
- aristocracy
