Thomas Nagel is an American philosopher, currently University Professor and Professor of Philosophy and Law at New York University, where he has taught since 1980. His main areas of philosophical interest are philosophy of mind, political philosophy and ethics. He is well-known for his critique of reductionist accounts of the mind in his essay "What Is it Like to Be a Bat?" (1974), and for his contributions to deontological and liberal moral and political theory in The Possibility of Altruism (1970) and subsequent writings.

Thomas Nagel was born to a Jewish family in Belgrade, Yugoslavia (now Serbia). He received a BA from Cornell University in 1958, a BPhil from Oxford University in 1960, and a PhD from Harvard University in 1963 under the supervision of John Rawls. Before settling in New York, Nagel taught briefly at the University of California, Berkeley (from 1963 to 1966) and at Princeton University (from 1966 to 1980), where he trained many well-known philosophers including Susan Wolf, Shelly Kagan, and Samuel Scheffler, who is now his colleague at NYU. In 2006, he was made a member of the American Philosophical Society.

Nagel is a Fellow of the American Academy of Arts and Sciences and a Corresponding Fellow of the British Academy, and has held fellowships from the Guggenheim Foundation, the National Science Foundation, and the National Endowment for the Humanities. In 2008, he was awarded a Rolf Schock Prize for his work in philosophy, the Balzan prize, and the honorary degree of Doctor of Letters from Oxford University.