- Sin
- Singularity
- Skyhooks
- Sociobiology
- Sociology
- Sociology of Knowledge
- Sociology of Religion
- Soul
- Space
- Space and Time
- Space-Time
- Special Divine Action
- Special Providence
- Special Theory of Relativity
- Spirit
- Spirituality
- Spirituality and Faith Healing
- Spirituality and Health
- Spirituality and the Practice of Science
- Steady State Theory
- Stem Cell Research
- String Theory
- Subjectivity
- Suffering
- Supernaturalism
- Superstrings
- Supervenience
- Symbiosis
- Symmetry
- Systems Theory
