John Iliffe may refer to:
- John Iliffe (dentist) (1846–1914), British-born Australian dentist
- John Iliffe (computer designer) (1931-2020), inventor of the Iliffe vector and pioneer of descriptor-based computer architectures
- John Iliffe (historian) (born 1939), British professor of African history
- John Wesley Iliff (1831-1878), cattle rancher and founder of the Iliff School of Theology
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