Deliberative democratic theory emphasises the importance of informed and reflective discussion and persuasion in political decision-making. The theory has important implications for constitutionalism - and vice versa - as constitutional laws increasingly shape and constrain political decisions. The full range of these implications has not been explored in the political and constitutional literatures to date. This unique Handbook establishes the parameters of the field of deliberative constitutionalism, which bridges deliberative democracy with constitutional theory and practice. Drawing on contributions from world-leading authors, this volume will serve as the international reference point on deliberation as a foundational value in constitutional law, and will be an indispensable resource for scholars, students and practitioners interested in the vital and complex links between democratic deliberation and constitutionalism.