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Ernest Nagel (November 16, 1901 — September 20, 1985) was a Czech American philosopher of science. Along with Rudolf Carnap, Hans Reichenbach, and Carl Hempel, he is sometimes seen as one of the major figures of the logical positivist movement.

Nagel was born in Nové Mesto nad Váhom (now in Slovakia, then part of the Austro-Hungarian Empire). His mother, Frida Weiss, was from the nearby town of Vrbove (or Verbo). He emigrated to the United States at the age of 10 with his family, and became a U.S. citizen in 1919. He received a BSc from the City College of New York in 1923, and earned his PhD from Columbia University in 1931, with a dissertation on the concept of measurement. Except for one year (1966-1967) at Rockefeller University, he spent his entire academic career at Columbia, becoming a University Professor in 1967 until his retirement in 1970, after which he continued to teach. He was elected to the National Academy of Sciences in 1977.

His work concerned the philosophy of mathematical fields such as geometry and probability, quantum mechanics, and the status of reductive and inductive theories of science.His 1961 masterpiece, The Structure of Science, practically inaugurated the field of analytic philosophy of science. He expounded the dfferent kinds of explanation in different fields, and was sceptical about attempts to unify the nature of scientific laws or explanations. He was the first to propose that by positing analytic equivalencies (or "bridge laws") between the terms of different sciences, one could eliminate all ontological commitments except those required by the most basic science. He also upheld the view that social sciences are scientific, and should adopt the same standards as natural sciences.

Nagel wrote An Introduction to Logic and the Scientific Method with Morris Raphael Cohen, his CCNY teacher in 1934. In 1958, he published with James R. Newman Gödel's proof, a short book explicating Gödel's incompleteness theorems to those not well trained in mathematical logic. He edited the Journal of Philosophy (1939—1956) and the Journal of Symbolic Logic (1940-1946).

He had two sons, Alexander Nagel (professor of mathematics at the University of Wisconsin) and Sidney Nagel (professor of physics at the University of Chicago).

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