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Dan Ariely (Hebrew: דן אריאלי; born April 29, 1967) is an Israeli-American professor and author. He serves as a James B. Duke Professor of psychology and behavioral economics at Duke University. He is the co-founder of several companies implementing insights from behavioral science. Ariely wrote an advice column called "Ask Ariely" in The Wall Street Journal from June 2012 until September 2022. He is the author of the three New York Times best selling books Predictably Irrational, The Upside of Irrationality, and The Honest Truth about Dishonesty. He co-produced the 2015 documentary (Dis)Honesty: The Truth About Lies.

In 2021, a paper with Ariely as the fourth author was discovered to be based on falsified data and was subsequently retracted. In 2024, Duke completed a three-year confidential investigation and according to Ariely concluded that "data from the honesty-pledge paper had been falsified but found no evidence that Ariely used fake data knowingly".

Ariely's life, research, and book Predictably Irrational inspired the NBC television series The Irrational; it premiered on September 25, 2023.