I
- Ibn Rushd (Averroes)
- Ibn Sina (Avicenna)
- Identity Theory
- Idealism, German
- Ikhwān al-Safā’
- Imagery and Imagination
- Immortality
- Incarnation
- Inconsistent Mathematics
- Indian Materialism – Lokāyata/Cārvāka
- Indispensability Argument in the Philosophy of Mathematics
- Individualism in Classical Chinese Thought
- Inductive and Deductive Arguments
- Informal Logic, Fallacies of
- Intentionality, Collective
- Internalism and Externalism in Epistemology
- Interventionism
- Introspection
- Irigaray, Luce
- Ismaili Philosophy