Achille C. Varzi (born May 8, 1958) is an Italian-born philosopher who is John Dewey Professor of philosophy at Columbia University.

Varzi is also Bruno Kessler Honorary Professor at the University of Trento and, since 2017, Visiting Professor at the University of Italian Switzerland.

[2] Varzi has made notable contributions to the fields of philosophical logic (mainly vagueness, supervaluationism, paraconsistency, formal semantics) and metaphysics (mainly mereology and mereotopology, causation, events, and issues relating to identity and persistence through time).

His first book, Holes and Other Superficialities (1994, with Roberto Casati), was an exploration of the realist ontology of common sense and naive physics.

Varzi is also a prolific writer for the general public and contributes regularly to several Italian newspapers.