Lewis Madison Terman (January 15, 1877 – December 21, 1956) was an American psychologist, noted as a pioneer in educational psychology in the early 20th century at the Stanford Graduate School of Education. He is best known for his revision of the Stanford-Binet IQ test and for initiating the longitudinal study of children with high IQs called the Genetic Studies of Genius. He was a prominent eugenicist and was a member of the Human Betterment Foundation.