Christian Stephen Smith (born 1960) is an American sociologist, currently the William R. Kenan Jr. Professor of Sociology at the University of Notre Dame. Smith's research focuses primarily on religion in modernity, adolescents and emerging adults, sociological theory, philosophy of science, the science of generosity, American evangelicalism, and culture. Smith is well known for his contributions to the sociology of religion, particularly his research into adolescent spirituality, as well as for his contributions to sociological theory and his advocacy of critical realism.