James Mark Baldwin was an American philosopher and psychologist who was educated at Princeton under the supervision of Scottish philosopher James McCosh and who was one of the founders of the Department of Psychology at Princeton and the University of Toronto. He made important contributions to early psychology, psychiatry, and to the theory of evolution.

The Princeton University Department of Psychology, located in Peretsman-Scully Hall, is an academic department of Princeton University in Princeton, New Jersey. For over a century, the department has been one of the most notable psychology departments in the country. It has been home to psychologists who have made well-known scientific discoveries in the fields of psychology and neuroscience.