Drawing on the risk-sharing concept, this book delves into the core concept of economic capital from an Islamic perspective, including comparisons to conventional finance theory. Furthermore, it introduces alternative models and offers practical examples to strengthen the regulation and supervision of the Islamic banking system. It also addresses critical policy challenges concerning economic capital in Islamic finance, especially in dual banking countries. This book seamlessly integrates new theory with empirical insights and discusses emerging themes, including stress testing and compliance issues. Most of the chapters are illustrated with real-world cases and practical examples. This book is intended for advanced degree students in finance, and investment professionals, as well as financial practitioners and advisors, particularly those who are pursuing Islamic economics and finance courses.