This article provides an overview of the current state of assessment and clinical intervention approaches for youth with juvenile legal system (JLS) involvement. The review includes (a) a brief overview of characteristics of youth with JLS involvement; (b) current screening and assessment frameworks within the JLS that identify treatment needs; (c) an overview of effective clinical interventions for common behavioral health concerns among youth with JLS involvement, including information about tailoring interventions to address the multiple intersecting identities (e.g., race, ethnicity, gender identity, sexual orientation) of youth within the JLS; and (d) an overview of implementation models and scalability of interventions.