If your work involves using radioactive materials or X-ray equipment, for example in scientific research or teaching, then you work with ionising radiation. On this page, you will find more information on how to do this safely and responsibly.

Historian Seran de Leede delved into the life of Lie Alma (1909–1990), the courageous woman from the Dutch province of Drenthe who spoke out against fascism in the 1930s and remains a source of inspiration to this day.

People from the Dutch islands of Bonaire, Saba and Sint Eustatius say that violence (mainly verbal) is fairly common in families. This is according to research by Leiden University, the University of Curaçao and UNICEF Netherlands. The researchers make recommendations for preventing such violence over…

Each year on the university’s birthday, children at primary schools in Leiden and The Hague have a lesson from a professor – about children’s rights and robots in surgery, for example. The children get to do activities. And ask questions: ‘How do you become a professor?’

Personal development, Working effectively

The Leiden University Fund (LUF) has been active since 1890 as an independent support foundation for Leiden University. It supports education and research through grants, endowed chairs, scholarships, and awards. In addition, LUF organises alumni events to strengthen the connection with former stude…

Management

Mozambican politician and child rights activist Graça Machel will receive an honorary doctorate from Leiden University for her commitment to the rights of women and children in Africa and elsewhere. She will be awarded the honorary doctorate on the Dies Natalis, the University’s foundation day, on 8…

Do you need help creating or using online teaching methods, or are you running into difficulties? We are here to help you with your ICT- and didactic-related queries.

The University has national holidays and compulsory closures. National holidays are not deducted from your vacation hours, whereas compulsory closures are.

From 16 to 23 October 2025, the Faculty of Governance and Global Affairs (FGGA) will host the second edition of Cyber Week. Following last year’s success, we will once again shine a daily spotlight on our teaching and research in the field of cybersecurity through LinkedIn and Instagram. Today’s societal…

Bachelor, Master, Short Course, PhD

Pop-up art studio

Pop-up art studio

In November, the Dutch will elect a new parliament. Not all eligible citizens will go out and vote, however. How can this be explained, and how big of a problem is it? International research into voter turnout can shed new light on this issue – and offer possible solutions.

The interdisciplinary research programme ‘Liveable Planet’ has created a new network, aimed at all young Leiden researchers working on sustainability issues.

Master, PhD

Conference, D&I Event

Most young alumni who graduated during the COVID-19 pandemic did not get a graduation ceremony, nor did they have the chance to sign their name in the Sweat Room. Thanks to the Alumni Office, they now have the chance to do so after all.

Whether finding signals of dark matter or discovering hydrogen in the vicinity of exoplanets, Leiden astronomers are world players in their field, and they are part of a long tradition: Leiden was the first university in the world to have its own observatory.

Bachelor, Master

What should you do if you want to create and send a newsletter or mailing in both Dutch and English?

Health conditions and social problems often go hand in hand. To address this complex issue in families in The Hague, researchers, managers, support services, policymakers and residents are joining forces. What are the results of this transdisciplinary approach?

Orange the World 2025

Study support

How the TikTok account came across his publication remains a mystery to researcher Martín Hernán Di Marco. But he is well aware that his work has gone viral. The video has now been viewed five million times and shared more than 100,000 times.

Study support

Intelligence and security services often operate in the shadows. Michael Kowalski calls for a clear, applied ethical framework as the foundation of intelligence work in a democracy.

Leiden academics Remco Breuker and Auke-Florian Hiemstra stand to win the title of Person of the Year.

In his leaving interview, Martijn Ridderbos doesn’t have to think long when asked what he is most proud of. ‘Bringing people together; creating things together. Reducing the gap between researchers and the staff who support them because the latter are essential. We’ve achieved that and the seeds have…

'Let's make this a twice-yearly tradition!'– a feeling shared by many after the vibrant Research Day. Engagement started early, with participants connecting informally over good coffee before the formal start of the event on 19 November.

Koos Biesmeijer, Professor of Natural Capital, and Claire van Megen, an Educational and Child Studies student, are in with a chance of winning Leiden’s Person of the Year title.

Across Latin America, stories of violence against women reveal how deeply gender, power en inequality are intertwined. Researcher Martín Hernán Di Marco tells how storytelling, activism and research together challenge the global cycle of violence against women and girls.

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LUC historian Jacqueline Hylkema unmasks forgeries from the early modern Dutch Republic in the research project "Mapping the Fake Republic".

The free AI and Ethics course (in Dutch) is available online to anyone who wants to find out more about the ethical implications of artificial intelligence. One of the eight experts featured in the course is Professor Reijer Passchier. ‘Artificial Intelligence is spreading so fast and has such an impact…