The scholarship of teaching and learning in higher education is concerned with advancing pedagogical knowledge and teaching practice to improve student learning and associated outcomes in higher education. This study used data from the Wabash National Study of Liberal Arts Education to examine the effects of peer learning experiences on gains in psychological well-being after four years of college. Results indicate a significant, positive influence of peer learning on the Ryff scale of psychological well-being [Ryff, C. D., and C. L. Keyes. (1995). "The Structure of Psychological Well-Being Revisited." "Journal of Personality and Social Psychology" 69 (4): 719-726]. In addition, peer learning had a significant positive effect on all but one of the Ryff well-being subscales (autonomy, environmental mastery, personal growth, positive relations with others, purpose in life, and self-acceptance). This research supports the use of peer learning as an important pedagogical practice.