Daniel Todd Gilbert is an American social psychologist and writer, born on November 5, 1957. He is the Edgar Pierce Professor of Psychology at Harvard University, renowned 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, translated into more than 30 languages, and winner of the 2007 Royal Society Prize for Science Books. Gilbert has written essays for numerous newspapers and magazines, hosted a non-fiction television series on PBS, and delivered three popular TED talks.