The paper traces the origins of psychology in Nigeria to educational psychology and counselling courses offered in faculties of humanities and education in premier Nigerian universities and theological institutions. With time, the advent medical schools included psychology and behavioral science courses to prepare medical students, midwifery and nursing students for practice. In the medical school's psychology courses were taught in the commencement years under community health programmes and as a component of psychiatry courses in the concluding part of medical training. These developments provided the impetus for the creation of psychology programmes in the faculties of social sciences in the Departments of sociology. Eventual accreditation of autonomous departments of psychology led to the formalization of professional structures such as the Nigerian Psychological Society and the Nigerian Association of Psychology. Psychology in Nigeria is actively driven by the Nigerian Psychological Association and its affiliates. In the advent of the Pan African Psychology Union, Psychology in Nigeria has been better formalized as a profession, attaining milestones such as being mainstreamed as a civil service career, providing prospects for graduates of psychologists to be employed and promoted to peak status as psychologists in their respective areas of specializations. The Pan -African Psychology Union continues to provide support in building leadership capacity and advocacy with national governments for increased recognition and incorporation of psychology in their development agendas.