The opening of the Academic Year 2025-2026 took place on Monday 1 September 2025 in the Pieterskerk church.

OPERA aims at establishing open and advanced research analytics practices and systems at Danish universities and in the Danish landscape of research analytics stakeholders.

Getting your bachelor’s degree in Holland? Visit Leiden Universities Bachelor’s Open Day and explore which bachelor’s programme might suit you best.

This focal area is concerned with studying and promoting openness of research information, for instance information about the outputs and activities of researchers and research teams. It also focuses on the use of open research information to support evaluation and policy making in science.

On this page you find all the ways through which the Institute of Psychology aims to foster Open Science.

In the podcast series 'Open Geesten', historians Joost Welten and Nadia Bouras tell us about their research and how history is intergrated in modern society. In short: what can the past tell us about the present?

The NVIC library is a public, academic reference library. Entrance is free—no membership needed—and offers access to our book collection and two reading rooms, which have a WiFi connection. It is not possible to borrow books from our library.

Opening hours are based on local time. On national and Moroccan holidays the NIMAR is generally closed.

PathOS aims to contribute to a better understanding and measurement of Open Science impacts and their causal mechanisms. This is pivotal in order to develop effective OS policy in the EU (European Union). It will do so by collecting concrete evidence of OS effects, by studying the pathways of OS practices,…

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The Open Science Lab bundles expertise on Open Science at CWTS and contributes to and studies the transition towards Open Science at CWTS, Leiden University, and beyond. It serves as a knowledge broker, facilitator, and platform for learning and exchange.

Leiden University has an Open Access policy and a Copyright Information Office.

Leiden University has an Open Access policy and a Copyright Information Office.

Leiden University policy requires researchers to make all their Leiden-affiliated peer-reviewed articles available.

OSCL is a learning community where anyone associated with Leiden University can learn and talk about open science practices. Example events are Open Science cafés, workshops, and walk-in-hours. The what Open science is an umbrella term for an approach to science that aims to make scientific…

Want to study abroad? Visit the Master’s Week of Leiden University and find which master's programme taught in Leiden or The Hague is right for you.

The opening times of the Humanities buildings vary. The Lipsius building is opened during evenings as well, the other faculty buildings retain office hours.

It is advisable to open Dutch bank account once you move to The Hague (if you do not have one already), as it will allow you to get many other services such as a mobile phone contract, transportation, etc.

We develop open micro cavities to trap light in small volumes and thereby increase the interaction with intra-cavity emitters. Important aspects in this development are the optical penetration in the mirrors, coupling between optical modes, and scattering and clipping losses.

In July 2022, Leiden hosted the ESOF conference.

The aim of this study is to further develop the Open Science Monitor, which started as a pilot study.

Dutch knowledge institutions are taking steps to recognise and reward open science. On 13 December, the Open Science NL Steering Board approved a total of 1.2 million euros in grants to 23 institutions. The Centre for Science and Technology Studies (CWTS) leads the national coordination of the local…

In 'That's Why Teacher', our educators share their experiences. Asking challenging questions to seek a deeper understanding is how Stella Trompet perceives the growth of her students. She serves as a lecturer in the half-minor and master's programme Health, Ageing, and Society at LUMC/Leiden Univers…

In higher education, Open Educational Resources (OER) are available for anyone to use, but they are not widely used.

Positive expectations can influence sensations of itch and evoke placebo effects, whereas negative expectations can trigger nocebo effects in itch. There is evidence that placebo effects can occur even when people know that they are taking a placebo. Little is known about how these so-called open-label…

In 2023, the OSCL, together with the University Library and Academia in Motion, ran a survey to better understand the state of Open Science at our university. In this year's follow-up, we are asking you to give your input, so we can jointly develop how Open Science evolves in our university.

Over the next two years, CWTS and Dialogic will develop a robust and context-specific monitoring and evaluation framework for Open Science in the Netherlands. This will be accompanied by the development of a prototype dashboard to showcase how such an Open Science monitor could be made visible.

On this page you'll find the recordings of the programme presentations held at the Leiden University Bachelor's Online Open Day of 7 October 2023. Perhaps you joined this event and would like to rewatch the presentations or are curious about ones you didn’t see the first time around. Or you haven't…

Damien van Puyvelde and Fernando Tabárez Rienzi examine the evolution of Open-Source Intelligence (OSINT).

Study information

A Humanities degree gives you a solid start on the job market. Here you can find up-to-date information about Humanities graduates on the job market, as well as alumni stories.

Academic ceremony

Combining results from bibliometric analyses, a global sample of researcher opinions and case-study interviews, a new report reveals that although the benefits of open research data are well known, in practice, confusion remains within the researcher community around when and how to share research…

How sustainable are open data infrastructures? Will the data we need in the future be available and usable? This project takes COVID-19 data/infrastructures as a case to study the sustainability and dynamics of open data infrastructures.

Join the OSCL community to share your experience and learn more from others at Leiden University

The opening of the Academic Year 2019-2020 took place on Monday 2 September 2019 in Pieterskerk church.

De opening of the Academic Year 2021-2022 took place on Monday 6 September 2021 in Pieterskerk church.

The opening of the Academic Year 2024-2025 took place on Monday 2 September 2024 in the Pieterskerk church.

De opening of the Academic Year 2023-2024 took place on Monday 4 September 2023 in Pieterskerk church.

De opening of the Academic Year 2022-2023 took place on Monday 5 September 2022 in Pieterskerk church.

Leiden University offers support in the different stages of your research lifecycle.

The opening of the Academic Year 2018-2019 took place on Monday 3 September 2018 in Pieterskerk church.

The opening of the Academic Year 2017-2018 took place on Monday 4 September 2017 in Pieterskerk church.

The opening of the Academic Year 2020-2021 took place on Monday 31 August 2020 in Pieterskerk church.

The opening of the Academic Year 2016-2017 took place on Monday 5 September 2016 in Pieterskerk church.

Study information

On 10 October 2019, Janneke Vink defended her thesis 'The Open Society and Its Animals'. The doctoral research was supervised by Prof. P.B. Cliteur.

In order for professionals to keep learning throughout their careers, it is necessary to be able to steer their own learning process