Survivors of conversion practices - interventions meant to stop gender transition - have likened these to torture. In the last decade, bans on these deeply unethical and harmful processes have proliferated, and countless governments across the world are considering following suit. However, despite this political momentum, few governments, scholars, or advocates have focused on the conversion experiences of transgender people. Banning Transgender Conversion Practices centres trans realities in rethinking and pushing forward the legal regulation of conversion therapy. It also considers pivotal questions for anyone interested preventing these harmful interventions. What is the scope of bans? How do they differ across jurisdictions? Are bans constitutionally valid? What are the advantages and disadvantages of legislative approaches to regulating trans conversion therapy? How well do these prohibitions work, and how can they be improved? In answering these questions, she synthesizes statutory interpretation, comparative and constitutional analysis, bioethics, the sociology of professions, and policy evaluation to conclude that preventing conversion efforts necessitates affirmative health care professional cultures and the adoption of detailed laws that clearly communicate which practices are banned. Importantly, her analysis culminates in a carefully annotated model law that offers unambiguous and detailed guidance for legislatures and policymakers.