Considering forensic psychology’s varying stages of development across the world, this work briefly explores historical developments, the field of practice, training, licensing, legislation, and associated challenges in South Africa, the United States, and Canada. While there are numerous similarities, a few differences are evident. Among the common areas of practice, psychologists are involved in assessments to determine fitness (competency) to stand trial, criminal responsibility in adults, as well as assisting courts in making determinations on criminal responsibility in the case of children in conflict with the law. In South Africa, psychological assessments of sexual violence complainants with intellectual disability are also required by courts. Psychological intervention, research, and policy development work are also conducted in the three countries. Challenges appear in the intersection between psychology and the law, expectations of psychologists, and the inclusion of psychologists in evaluation panels in South Africa and Canada. It is clear that psychologists are playing an active role in the professional development of the field, research, and coordinating with legislative authorities in advancing forensic mental health and advocating for people with mental health problems. However, across the three countries, there is a need for continued focus on the broader issues of diversity, equity, and inclusion with respect to the forensic populations being served, and there has to be a concerted effort to address the psychosocial needs of marginalized communities.