Granville Stanley Hall (1 February, 1844 - 24 April, 1924) was a psychologist and educationalist who pioneered American psychology. His most influential publication was Adolescence, Its Psychology and Its Relations to Physiology, Anthropology, Sociology, Sex, Crime, Religion and Education where he introduced the psychology of Adolescence.

Hall was the first president of the American Psychological Association and also the first president of Clark University (1888 - 1920).