Stumbling on Happiness is a nonfiction book by Daniel Gilbert, published in the United States and Canada in 2006 by Knopf. It has been translated into more than thirty languages and is a New York Times bestseller.

Daniel Todd Gilbert is an American social psychologist and writer. He is the Edgar Pierce Professor of Psychology at Harvard University and is known for his research with Timothy Wilson of the University of Virginia on affective forecasting. He is the author of the international bestseller Stumbling on Happiness, which has been translated into more than 30 languages and won the 2007 Royal Society Prizes for Science Books. He has also written essays for several newspapers and magazines, hosted a non-fiction television series on PBS, and given three popular TED talks.