I
- Ibn Rushd (Averroes)
- Ibn Sina (Avicenna)
- Idealism, German
- Identity Theory
- Ideology, Science and
- Ikhwān al-Safā'
- Imagery and Imagination
- Imagination, Hume on
- Immortality
- Incarnation
- Inconsistent Mathematics
- Indexicals, Demonstratives and
- Indian Materialism—Lokāyata/Cārvāka
- Indispensability Argument in the Philosophy of Mathematics
- Individualism in Classical Chinese Thought
- Induction and Confirmation
- Inductive and Deductive Arguments
- Infinite, The
- Infinitism in Epistemology
- Informal Logic, Fallacies of
- Institution Theory
- Integrated Information Theory of Consciousness
- Intentionality
- Intentionality, Collective
- Internalism and Externalism in Epistemology
- Internalism and Externalism in Mind and Language
- Interventionism
- Introspection
- Irigaray, Luce
- Ismaili Philosophy