<p>This study aims to review national guidelines and best practice standards for how state boards should regulate clinical supervision in social work. It also aims to examine variations in state rules regarding clinical supervision regulations and categorize states by the strength of their regulation of clinical supervision. The analysis of the Model Practice Act and Best Supervision Standards provides the following four domains for regulating clinical supervision: (1) supervisor qualifications, (2) supervision plans, (3) documentation and reporting, and (4) supervision timeframe and hours. The analysis of state regulatory rules, combined with data from clinical license applicants, indicates that seven states —representing approximately 21% of clinical license applicants nationwide —had weaker regulation, lacking rules in all or most regulatory domains in their social work statutes. In contrast, 23 states—representing approximately 24% of license applicants nationwide—had stronger regulation of clinical supervision, having rules in all four regulatory domains. The findings suggest that further research is necessary to investigate how the absence of regulatory rules affects the quality of clinical supervision, the clinical workforce, and public safety measures.</p>