Do you have to be able to say everything on Twitter and Facebook? Is Instagram morally obliged to remove photos from attacks? Should we allow the terrorist group to recruit new members on the internet?

LUCIS promotes high-quality research on Islam and Muslim societies and actively communicates the insights and findings of that research to the larger public.

Moritz Jesse, Associate Professor of EU Law at the Europa Institute, has published his book, “The Civic Citizens of Europe: The Legal Potential for Immigrant Integration in the EU, Belgium, Germany, and the United Kingdom”.

On 27 June 2019, Barry Bussey defended his thesis 'The Legal Revolution Against the Accommodation of Religion: The Secular Age v. The Sexular Age'. The doctoral research was supervised by Prof. dr. P.B. Cliteur.

From where litter ends up to which languages are spoken in Leiden and The Hague: over 50 interesting, surprising, complex and entertaining questions were sent in for the Citizen Science project to mark our 444th anniversary. Not one but two Citizen Science projects will be starting this year in Leiden…

Does a moving hybrid zone leave a genomic footprint?

Shining a new light on the Roman world

Research and education are two of the pillars the SAILS programme is built on and which we are keen to expand on. Communication of research to researchers, students, companies and other societal partners is another key element.

What should you do in an emergency?

Security and Legitimacy is one of the three organisational clusters of the Institute of Political Science.

Microbial Sciences' contribution to the Bioactive Molecules research theme is to discover new bioactive molecules and enzymes and unravel their mechanisms of action, regulatory networks, and the (bio)synthetic pathways required for their production.

One of the goals of the Citizen Science lab is to be an incubator for citizen science projects. Over the years, the lab has been involved in creating and supporting various projects. Get inspired!

The Greek and Roman History Team concentrates on the study of the economies, societies and cultures of the large empires of the Graeco-Roman world, starting with the empires of Alexander the Great and his successors.

The LUGO team is part of the Administration and Central Services department of the university, with it falling under the Strategy and Academic Affairs department. Naturally, it falls into the sustainability team of the University, which consists of two full-time employees alongside the LUGO Team. The…

When you apply for admission, you’ll be asked to submit several documents. The documents that are required depend on your educational background and chosen study programme.

What evaluative languages (errors, mistakes, vices, etc.) did book reviewers employ? To what extent and on what occasions did they invoke early modern vices? And to what extent did this differ across fields or change over the course of the century?

What are best practices for teaching students to engage with 'wicked' problems?

The essay For progress has been published to mark the 450th Dies Natalis of Leiden University. In 2025, we are celebrating our 450th anniversary, and the theme of this special year is Ahead of the Times.

In an increasingly complex and security-challenged society, the CSM programme, Intelligence and National Security, provides you with the theoretical and practical skills to understand the issues underlying security challenges and develop solutions for crisis and security management.

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

A diploma is a valuable document that the University issues only once. If somebody loses his or her diploma, he or she can download a copy in the diploma register.

This article describes that although the use of the concept of energy justice is new, normative interpretations have long been part of energy policy.

The area will undergo major changes, in a phased plan. Teaching will continue during this period. The existing education buildings will be tackled one by one. Some of the buildings will be reconstructed, and for others the building shell will undergo renovation. The Humanities Building is expected to…

This dissertation looks into the role of discretion granted by EU directives (Article 288 Treaty on Functioning of the European Union) in legislative decision-making and national transposition processes of these directives.

How do we process language and speech? How do we integrate information at different levels – intonation, sentence structure, meaning, tone, words, sounds - and how does information at one level interact with information at another level?

The project entails research by international comparison into the effects of commercialisation in heritage management on the academic relevance and quality of the results of work that is essentially applied research. The research is carried out by Prof. dr. W.J.H. Willems and dr. M.H. van den Dries…

This project aims at providing a broad perspective of the state of Science Technology and Innovation (STI) in Africa with a focus on global funding flows, in order to inform research funders in the continent, in particular those participating in the Science Granting Councils Initiative (SGCI). The project…

A cultural sequence of western coastal French Guiana from 5000 BP to present

Designing and synthesizing high-affinity ligands for a given drug target have always been among the more important challenges in the drug discovery process.

Papers in honour of Professor Annelou van Gijn

Unravelling Mindreading Skills through Storytelling and Narratives

Leiden and The Hague are real student cities and has everything you’ll need to turn your time as a student into the time of your life.

Interested in studying Ancient History at Leiden University? Find out what our alumni said about this master's programme.

The master's programme in Theoretical Philosophy at Leiden University offers students the opportunity to investigate fundamental questions concerning the nature of reality using the tools of analytic philosophy.

The Leiden Institute of History approaches early modern and modern European history from comparative and transnational perspectives.

Immersive, interdisciplinary and didactically-sound learning activities designed to promote capacity building in various game-based formats.

This dissertation presents a new perspective on the life, work and character of the Dutch physical chemist Jacobus Henricus van ’t Hoff, first recipient of the Nobel Prize in Chemistry, and one of the most important and colourful scientists in Dutch history. The image of Van ’t Hoff that emerges from…

In an increasingly complex and security-challenged society, the CSM programme, Cybersecurity Governance, provides you with the theoretical and practical skills to understand the issues underlying security challenges and develop solutions for crisis and security management.

Intelligence of the crowd, or in other words, intelligence of a large, random collective, exists mostly in social media platforms such as twitter. The collective does not comprise (at least not necessarily) experts on crises, just regular people mostly. Nevertheless, there is valuable intelligence to…

The fourth volume of Ex Novo has the pleasure to host Heleen van Londen, Marjo J. Schlaman, and Andrea Travaglia as guest editors of the special issue titled The Natural and The Cultural. Integrating Approaches in Landscape Heritage Management. This timely collection of peer-reviewed papers and short…

Archaeological and Anthropological perspectives

You’ve been accepted! Leiden University looks forward to welcoming you as a new student. Your next step is to prepare for your studies. Below you can find some tips to help you get a head start as you embark on your studies at Leiden University.

In an increasingly complex and security-challenged society, the CSM programme, Terrorism and Political Violence, provides you with the theoretical and practical skills to understand the issues underlying security challenges and develop solutions for crisis and security management.

Making extensive use of primary source materials this study contributes to existing scholarship in the field of eighteenth-century grammars and grammarians by providing an in-depth study of Ash’s Grammatical Institutes and its influence on other popular grammars for children.

On 23 February 2022, Cale Davis defended the thesis 'Prosecutorial Discretion in International Criminal Justice'. The doctoral research was supervised by Prof. C. Stahn en Dr. J.C. Powderly.

Dario Fazzi

This research cluster is a part of the Institute of Political Science’s research programme ‘Institutions, Decisions and Collective Behaviour’. Its members investigate the drivers of political conflict and various types of crises. They study how citizens, political institutions and international organizations…