The mass incarceration of Black people in the United States is gaining attention as a public health crisis with extreme mental health implications. Although it is well-documented that historical efforts to oppress and control Black people in the United States helped shape definitions of mental illness and crime, many psychologists are unaware of the ways our field has contributed to the conception and perpetuation of anti-Blackness and, consequently, the mass incarceration of Black people. In this paper, we draw from existing theory and empirical evidence to demonstrate historical and contemporary examples of psychology’s oppression of Black people through research and clinical practices and consider how this history directly contradicts the American Psychological Association (APA)’s ethics code. First, we outline how anti-Blackness informed the history of psychological diagnoses and research. Next, we discuss how contemporary systems of forensic practice, including assessment and treatment approaches informed by psychological research, maintain historical harm. Specific recommendations highlight strategies for interrupting the criminalization of Blackness and offer example steps psychologists can take to redefine psychology’s relationship with justice. We conclude by calling on psychologists to recognize our unique power and responsibility to interrupt the criminalization and pathologizing of Blackness as researchers and mental health providers.