Benjamin Bernard Lahey is an American psychologist and developmental epidemiologist.

He is the Irving B. Harris Professor Emeritus in the Departments of Health Studies and Psychiatry and Behavioral Neuroscience at the University of Chicago.

He has conducted research on psychological problems in children, adolescents, and adults such as ADHD and antisocial behavior, and he was a member of a scientific panel that constructed the current definition of ADHD in the 1990s.

[1] He was one of the authors of the papers that first hypothesized a hierarchical organization of dimensions of psychological problems, with a general factor at the top of the hierarchy.

[5] Lahey has received the Distinguished Research Award from the Society of Clinical and Adolescent Psychology.