The proceedings of the XXIX FIDE Congress in The Hague in 2021 are published in four volumes. This book (Vol. 1) contains the reports of the General Rapporteur (Michael Dougan), the Institutional Rapporteur (Michał Bobek) and the National Rapporteurs on Topic 1: National Courts and the Enforcement of EU Law: The Pivotal Role of National Courts in the EU Legal Order.