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- On Denoting
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- R. M. Hare
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- Roman Empire
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- Saul Kripke
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- Susan Haack
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- Symbiosism
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- Søren Kierkegaard
- T. H. Green
- Taoist philosophy
- Tautology (logic)
- The Analysis of Sensations
- The Course in Positive Philosophy
- The Foundations of Arithmetic
- The Logic of Modern Physics
- The Logic of Scientific Discovery
- The Poverty of Historicism
- The Poverty of Theory
- The Principles of Mathematics
- The Rhetoric of Economics
- The Scientific Image
- The Structure of Scientific Revolutions
- The Two Cultures
- The Universe in a Nutshell
- Theodor W. Adorno
- Theological noncognitivism
- Theory of descriptions
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- Thomas Hobbes
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- Thomas Nagel
- Thomas Samuel Kuhn
- Three Seas Initiative
- Timothy Williamson
- To be
- Toleration
- Tractatus Logico-Philosophicus
- Truth
- Truth and Method
- Truth-bearer
- Two Concepts of Liberty
- Two Dogmas of Empiricism
- Uncertainty principle
- Unilalianism
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- Unity of science
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- Use–mention distinction
- Value (ethics)
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- Wilfrid Sellars
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- William Alston
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- William Lycan
- Wittgenstein on Rules and Private Language
- Women in philosophy
- World Hypotheses
- World War I
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- Xunzi (philosopher)
- Zhuang Zhou
- Émile Durkheim