The psychology major at St. Mary's College introduces students to the breadth and current state of psychological knowledge, the scientific methodologies of the field, and the application of psychology to real-world problems and events. The general objective of the major is to enhance the understanding of behavior and mental processes and to be able to link this knowledge to other disciplines. The psychology faculty has a wide range of research interests in both human and animal behavior.

Students have the opportunity to work with faculty on research projects throughout their academic career and in preparation for their St. Mary's project in their senior year. The opportunity to gain experience in research will also prepare students for graduate school and careers in psychology or related fields. Majors may participate in off-campus internships, field experiences, or international study, either before or as a part of their St. Mary's project.