Much clinical work in infant mental health includes working with families of young children involved in the complex arenas of the legal and child protection systems. These systems have their own distinctive languages, cultures, and values, but they share a concern with clinicians about the best interest of the child. This special issue explores selected topics in this area, calling attention to research, policy, and clinical issues in forensic infant mental health. The purpose of the issue is to stimulate additional thinking and additional scholarly attention to these vital issues that have such importance for families around the world.