European policy affects our lives: from air quality to the frequency of a bus service. Leiden researchers analyse how the European Union functions, how countries apply European policy and whether this policy actually provides solutions and delivers.

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.

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

In this article, Madeleine Hosli, Professor of International Relations at the Institute of Security and Global Affairs, and Jaroslaw Kantorowicz, Assistant Professor at the Institute of Security and Global affairs, discusses the relevance of structural variables in a time where European politics are…

This edited volume offers a critical discussion of the trade-offs between transparency and secrecy in the actual political practice of democratic states in Europe. As such, it answers to a growing need to systematically analyse the problem of secrecy in governance in this political and geographical…

Cristina Grasseni’s project

How do chemical contaminants traverse and affect terrestrial biodiversity and ecosystems?

This book is the first comparative study of estimative intelligence and strategic surprise in a European context, complementing and testing insights from previous studies centred on the United States. It does extensive empirical analysis of open-source material and interviews in relation to three cases…

On 7 September 2023 Didem Durak Akser successfully defended a doctoral thesis and graduated.

Grasseni's contribution to this special feature on food cultures, food systems, and agriculture in Europe builds upon her ongoing project Food citizens? Collective food procurement in European cities: solidarity and diversity, skills and scale.

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

The Master’s in European Union Studies at Leiden University offers students an opportunity to study the EU from multiple disciplinary perspectives.

Mariana de Campos Françoso and Amy Strecker published a new article in the International Journal of Cultural Property last week entitled 'Caribbean Collections in European Museums and the Question of Returns'.

Project leader Esther Kentin has published an article on the European chemical regulation REACH and the restriction of microplastics in a physics journal.

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

Lecture, European Union Seminar

Lecture, European Union Seminar

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.

On 13 February, Professor Matthias Haentjens spoke at the conference “Proportionality in European Banking Regulation” at the Bank of Greece. This conference was organized by the Greek central bank, in cooperation with the University of Piraeus and the European Banking Institute (EBI).

On 7 April 2017 Labour Law professor Heerma van Voss spoke on reduction of working time in European countries during the economic crisis at the Hungarian Academy of Sciences in Miskolc, Hungary.

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 Institute of Private Law at Leiden University kindly invites you to an online book launch of the book Legal Pluralism in European Contract Law. The author will introduce the theme and summarise the main conclusions of the book, followed by comments from two panelists. Afterwards, there will be a…

Brexit has been a kind of shock therapy for the EU and has eventually led to more appreciation for European cooperation. That is what Professor Luuk van Middelaar claimed on 30 November at the conference ‘Brexit and the future of the European Union’ which marked the 60th anniversary of the Europa Institute…

The Team International Relations and European Studies addresses the interconnections and interdependence of contemporary global political, economic, security and culture from a multidisciplinary perspective rooted in the humanities. More specifically it is concerned with the study of international relations…

Nikki Ikani, Assistant Professor Intelligence and Security at the Institute of Security and Global Affairs (ISGA), has recently published her latest monograph 'Crisis and change in European Union foreign policy' with Manchester University Press.

The annual excursion of the Adv. LLM programme in European and International Human Rights Law (EIHRL) took place from Sunday 16 to Saturday 21 April.

The presence and participation of interest groups in policymaking processes has become a crucial component of Western democracies. These groups link society and policymakers and influence public policy choices. Their function however, is often taken for granted and not very well researched. Adrià Albareda…

A look into the political history of collecting and the collections of Andean mummies in Western European museums from 1830-1930 through archaeology and paleoimaging.

Research on this theme concerns Europe’s position in global markets, its response to the emergence of new international trade and financial actors that challenge institutions where Europe has long had considerable influence.

How can groundbreaking research help Europe tackle the huge challenges it faces? At the launch of the Leiden Europe Hub, academics and policymakers discussed this in the heart of European democracy: the European Parliament.

Archaeologist Quentin Bourgeois received an NWO Vidi grant to investigate the emergence of a pan-European culture in the third millennium BC. ‘We see ideas being shared across the entire continent in pre-literate societies. And not only that, for a thousand years, the same cultural ideas persist.’

On 20 June 2025, Melanie Fink presented her research on ‘Robo Swarms and Polygraphs: The Future of European Border Management and its Human Costs’ at the Research Workshop on ‘Migration law at the intersection of international, EU and domestic law: institutional structures and the protection of human…

How can we understand the implementation of EU policy and what challenges are involved?

On 25 August 2018, the Leiden Adv. LLM Study Programme in European and International Business Law (EIBL) celebrated 25 years of its existence.

Study information

On 21 April 2016, Leiden University College The Hague, in collaboration with The Hague Institute for Global Justice and the T.M.C. Asser Institute, hosted a book launch and panel discussion for Dr. Joris Larik’s new monograph “Foreign Policy Objectives in European Constitutional Law”, which has recently…

The European Council and the European Commission have a similar role in agenda setting. Both place issues on the EU agenda. However, these institutions have distinct designs. They have different political attributes (the European Council has considerably more political authority) and information-processing…

The Centre for the History of European Integration (CHEI) is an initiative that brings together scholars working on European integration, broadly conceived, from a historical perspective.

On 9 February students of the Master in European Law visited the new headquarters of Eurojust, one of the EU’s agencies for judicial cooperation in criminal matters based in The Hague.

What political factors affect the speed or duration of EU legislative decision-making?

Set up in 1991, this unique project aims to identify and describe the common lexical heritage of the most important Indo-European languages and language branches. The project has thus far resulted in twelve volumes published as The Leiden Indo-European Etymological Dictionary Series (Brill, Leiden).

International Relations and European Politics is one of the three organisational clusters of the Institute of Political Science.

The new project INFLANET will train young scientists in Europe to become experts in inflammation research. Professor Annemarie Meijer from the Institute of Biology Leiden coordinates the training.

EUROTYPES is a research project developed by political scientist Adina Akbik, for which she recently received a European Research Council Starting Grant. Her aim is to examine the impact of cultural stereotypes in European multi-level policy enforcement. One of EUROTYPES' innovations lies in its focus.…

On March 16 students and alumni of the Advanced LLM in European and International Human Rights Law were brought together in an online Zoom event organized by our programme coordinator, Mahshid Alizadeh, and head of the LLM, Rick Lawson.

Our Master Law in European and International Human Rights Law (LL.M.) looks at the various human rights protection mechanisms from a comparative perspective

Our research deals with the deep history of Europe and Eurasia, from the inception of farming up until the beginning of the Roman Period. This was a period in which key developments took place that had a profound impact on European landscapes and society until the present day. Our research and teaching…