On 2 April, the final of the Legal Tech Challenge 2026 took place in the Academy Building of Leiden University. During the final, teams of students pitched their technological solutions to societal challenges.

How do crises produce changes in specific European Union foreign policy areas, and how should we conceptualise these policy changes?

The Law of the European Union is a complete reference work on all aspects of the law of the European Union, including the institutional framework, the Internal Market, Economic and Monetary Union and external policy and action.

In this article, Madeleine O. Hosli and Wen Pan examine how intergovernmental dynamics shaped the European Stability Mechanism, using Liberal Intergovernmentalism to assess negotiation phases, the influence of major member states, and which theoretical assumptions hold or need qualification.

This thesis examines the complexity of legislative decisions within the EU, with a specific focus on the Council of the EU.

The European Homicide Monitor (EHM) offers a standardized framework for countries and regions to compare homicide characteristics, patterns and trends.

East European Politics is a refereed journal which publishes articles on the government, politics and international relations of the post-communist world.

Reconstructing language history and prehistory in the context of the Indo-European language family.

The researchers examine the Council of the European Union's voting behaviour between 2010 and 2021 and the impact of different independent variables.

Research on this theme concerns the legitimacy and effectiveness of Europe’s institutional order in the face of public alienation and normative contestation.

Study European politics, society, and international relations across four major European cities: Prague, Leiden, Krakow, and Barcelona. This two-year joint Master's programme offers a unique interdisciplinary experience.

No nation-state can solve today's global challenges on its own. In the specialisation International and European Governance you will obtain a deep understanding of the interplay between the international, EU, and (sub)national governance systems and how this interplay affects the capacity of public…

The League of European Research Universities (LERU) is a group of 24 leading European research universities.

Research on this theme addresses the systemic risks faced by European societies and affecting the quality of life of European citizens.

Leiden’s Institute for History has an exceptionally strong expertise in Medieval European History, with specialists whose interests cover virtually the whole continent.

This week the European Commission took a major step by starting infringement proceedings against the United Kingdom. The issue at stake is the contentious Internal Market Bill introduced by Boris Johnson’s government which is contrary to the Brexit Agreement.

Are you thinking about studying European Union Studies? Learn more and watch the introduction video.

European Border Communities provides an overview of interdisciplinary research on the dynamics, challenges and effects of cross border mobilities and the management thereof.

Research in the International Relations and European Studies Team addresses the interconnections and interdependence of contemporary global political, economic and cultural affairs from a multidisciplinary perspective rooted in the humanities.

On 23 juni 2019, Zygimantas Juska defended his thesis 'The Role of Collective Redress Actions to Achieve Full Compensation for Violations of European Union Competition Law'. The doctoral research was supervised by Prof. dr. T.R Ottervanger.

The book addresses the question “How and why do people become involved in European homegrown jihadism?

Almost all languages of Europe and of a large part of western Asia belong to a single language family, which is called Indo-European, and which includes modern languages like English, Dutch, Russian, Farsi, but also ancient ones like Ancient Greek, Latin, Hittite and Sanskrit.

European integration is under pressure. At the same time, the notion of a European administrative space is being explicitly voiced. But does a shared idea of the public servant exist in Europe?

The first results of the “Policing European Metropolises project” (PEMP) that associate Professor Elke Devroe and Professor P. Ponsaers launched in April 2013 are now published. Having been the referent for The Netherlands and Belgium in the Urbis project (Leonardo programme), the project focuses on…

In this research project, the protection of personal data is compared in eight EU member states: France, Germany, the UK, Ireland, Romania, Italy, Sweden and the Netherlands. The comparison of the countries is focused on government policies for the protection of personal data, the applicable laws and…

Brian Shaev

On 9 September 2020, Ruben de Graaff defended his thesis 'Concurrence in European Private Law'. The doctoral research was supervised by Prof. A.G. Castermans and Prof. S.C.G. Van den Bogaert.

Agrian History, 5300 BC - AD 1000; C.C. Bakels

Madeleine O. Hosli, Professor of International Relations, wrote this book in which she analyses the complex relations between the European Union (EU) as a regional organization and the United Nations (UN) as an international, global governance institution.

The overall objective of ECS is to widen and strengthen the European Citizen Science community through capacity building and awareness raising activities such as the creation of a European Citizen Science Academy and the establishment of a network of 28 ECS Ambassadors.

The European courtroom as political arena? Judicial interference in politically charged issues in European asylum law and criminal law

The project Advancing The European Multilingual Experience (AThEME) studied multilingualism in Europe by incorporating and combining linguistic, cognitive and sociological perspectives.

This book is the first to incorporate current academic literature and case law on European, transnational, and international media law into a comprehensive overview intended primarily for students.

A large amount of the EU's used or wasted textile is exported towards lower-income countries. Much of this exported textile is either burned or dumped and the amount that is truly reused or recycled is uncertain.

The early modern and modern Europeanists at the Leiden Institute of History approach the past from comparative and transnational perspectives, frequently placing the history of our continent in global contexts. Our research covers the geographical and thematic breadth of Europe since ca. 1500, with…

Are you thinking about studying Public Administration: International and European Governance? Learn more and watch the videos.

What is “teaching excellence” in Higher Education? Which different teaching excellence training, promotion and reward schemes exist across Europe? How can a common European teaching scheme look like? The e-NOTE project led by Leiden University seeks to answer these question in cooperation with five…

Hart Publishing in Oxford has published the first book in a series entitled ‘Restatement of Labour Law in Europe’. This particular book deals with the question of which employees are protected by labour law (‘The concept of employee’).

This article presents a new dyadic approach to studying voting behaviour in the Council of the European Union.

The Central and Eastern European Studies Centre is an interdisciplinary platform of scholars of Leiden University. The Centre’s mission is to bundle together, strengthen and disseminate existing research into the history, politics, and culture of the region, spanning the new member states of the EU,…

On 21 October 2021, Frederik Behre defended the thesis 'A European Ministry of Finance?'. The doctoral research was supervised by Prof. S.C.G. Van den Bogaert.

Het Hof van Justitie van de EU (HvJ) doet uitspraak in twee zaken, waarin het Poolse Constitutionele Hof de Poolse grondwet boven EU-recht plaatste. Hoogleraren Europees recht, Armin Cuyvers en Stefaan Van den Bogaert duiden de uitspraak in de media.