Although the field of constitutional law has become increasingly comparative in recent years, its geographic focus has remained limited. South Asia, despite being the site of the world's largest democracy and a vibrant if turbulent constitutionalism, is one of the important neglected regions within the field. This book remedies this lack of attention by providing a detailed examination of constitutional law and practice in five South Asian countries: India, Pakistan, Sri Lanka, Nepal, and Bangladesh. Identifying a common theme of volatile change, it develops the concept of 'unstable constitutionalism', studying the sources of instability alongside reactions and responses to it. By highlighting unique theoretical and practical questions in an underrepresented region, Unstable Constitutionalism constitutes an important step toward truly global constitutional scholarship.