- Abortion
- Adaptation
- Aesthetics
- Afterlife
- Age of the Universe
- Aggression
- Algorithm
- Algorithmic Complexity
- Altruism
- Anabaptist
- Anglicanism
- Animal Rights
- Anthropic Principle
- Anthropocentrism
- Anthropology
- Anthropology of Religion
- Anti-Realism
- Apologetics
- Aquinas, Thomas
- Aristotle
- Art, Origins of
- Artificial Intelligence
- Artificial Life
- Astronomy
- Astrophysics
- Atheism
- Atomism
- Attractor
- Augustine
- Automata, Cellular
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