This edited collection examines the tensions between Islam and European constitutionalism. Its 16 chapters, commissioned from established experts in the field, are divided into 4 parts: (I) Constitutional challenges, (II) Religious freedom and other human rights, (III) Supranational and comparative approaches, and (IV) Securitisation and Islamophobia. These substantive parts are preceded by an introductory chapter setting the scene and a concluding chapter seeking to draw robust conclusions and to venture some predictions for the years ahead.