Take a journey through the history and future of life on planet Earth.

The photo exhibition offers a unique glimpse into the research being carried out at Leiden University in The Hague. It features eight researchers connected by one common thread: their research has a real impact on the city and the people of The Hague.

What is the relationship between democracy and peace? Do the two go hand in hand, so that less democracy means less peace? Or can democracy work against peace: for example, by producing protectionist and militarist governments? Or is there something more deeply wrong with democracy as we know it, such…

Get on your bike… or your tandem, unicycle, electric bike, tricycle, penny-farthing, rickshaw or road bike! We’re going on a bike trip!

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The Just Peace festival is coming up shortly. From 21 to 24 September we will be celebrating peace in The Hague with some inspiring HagueTalks, the Peace in the Park festival and the annual Peace Run.

Preparatory year Leiden

Salicylic acid (SA) is a plant hormone, which is involved in the defense responses to pathogens and to abiotic stress, and in the regulation of plant growth and development.

Tracking early human behaviour through plant processing and -exploitation.

The Writing Lab helps students to become better academic writers. Our tutors offer support during any stage of the writing process, whether you’ve only just started and need help with planning, incorporating sources and/or making an outline, or whether you’re already writing a text and want to improve…

Basketry, cordage and textiles made of plant fibers or bark are rarely preserved in the archaeological record. By means of experimental archaeology and microwear analysis, we obtain indirect evidence about this important craft.

IBL researchers use the facility to study a wide range of wildtype and transgenic plants, including Arabidopsis, tomato, barley, rice, lettuce, radish, ornamentals, and various trees. Research also involves the interaction between plants and various microorganisms and insects, providing valuable insights…

A three-volume standard work on galls in Europe. Author Johannes C. (Hans) Roskam is associate professor emeritus in Evolutionary Biology and currently guest at Leiden University.

In this thesis, the role of plant-mediated soil legacy effects in shaping aboveground plant-insect interactions was investigated.

The Plant BioDynamics Lab (PBDL) is a laboratory dedicated to experiments designed to develop and validate quantitative mathematical models of dynamical processes in biology. The principal objective of developing these models is to make quantitative predictions about these processes.

Wijnhaven, Turfmarkt 99, 2511 DP, The Hague

Leiden University College (LUC) offers a Liberal Arts & Sciences programme, which is small in scale and intensive. You will go through a selection procedure where our admissions committee will assess your fit for LUC. In order to be considered for admission all applications need to apply in Studielink…

Leiden University College (LUC) offers a Liberal Arts & Sciences programme, which is small in scale and intensive. You will go through a selection procedure where our admissions committee will assess your fit for LUC. In order to be considered for admission all applications need to apply in Studielink…

The rise of the digital age affects public governance in many ways. Digitalisation and data impact every aspect of public governance and policy. Within Leiden University’s Public Administration institute, based in The Hague -the administrative capital of the Netherlands- our centre seeks to understand…

Linking botanical collections, peoples, and illustrations in seventeenth century Dutch Brazil

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Soil biodiversity is of great importance for the maintenance of multifunctionality in terrestrial ecosystems.

Plant Sciences' contribution to the Biodiversity & Evolution research theme is to understand what are the key drivers of plant biodiversity during evolution with a focus on plant life history and resilience traits and develop tools to restore and maintain plant biodiversity.

In 2025, GTGC co-organised with the City of The Hague and the Hague Humanity Hub a Just Peace Festival, a vibrant platform on the pressing global challenges of peace with justice. The festival involved a wide range of different activities, including dialogues, exhibitions, performances, film evenings,…

Biodiversity enables ecosystems to thrive through the synergy of functional differences among organisms. While human well-being strongly depends on biodiversity-driven ecosystem services, human actions are also at the root of current unprecedented biodiversity declines.

The Just Peace Dialogues were a set of meetings for public deliberation of key aspects of building peace in today’s world. The dialogues were held across seven days at the heart of the Just Peace Festival (16 - 22 June 2025).

Plant Sciences' contribution to the Bioactive Molecules research theme is to identify new plant bioactive molecules, and unravel their mechanisms of action in plant development or health, and the regulatory networks and (bio)synthetic pathways required for their production.

The Hague Diplomacy Blog intends to stimulate debate among academics and policy makers on the diplomatic aspect of international politics. The blog is edited by Saskia Postema, Caitlan Read and Clotilde Facon.

Plant Sciences' contribution to the Development & Disease research theme is to unravel the processes that allow plants to adapt to changing abiotic and biotic environmental conditions or stresses, with the aim to contribute to the sustainable production of food, flowers and bio-based products using…

The Pavement Plants Citizen Science Project invites citizens to monitor plant species growing around their homes, neighborhoods, or towns. The goal is to collaboratively monitor urban flora, measuring and revealing the species richness and biodiversity of the urban ecosystem. We believe this will lead…

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From 1 August 2018, Alanna O'Malley was appointed as Chair of United Nations Studies in Peace and Justice, focusing on the ‘lesser-known actors’ of the UN: women, the youth, the agents of informal diplomatic networks within the UN and actors from the Global South. This Special Chair has been created…

Plants are colonized by an astounding number of microorganisms that can provide different life-support functions, including nutrient acquisition and protection against (a)biotic stresses like drought or pathogen attack.

How do plants lure microscopically small 'support teams' into their roots for protection against diseases? And what functions are activated in the microbes and the plants?

For the past 25 years, we’ve been making a difference in The Hague. We proudly shared and celebrated this through the photo exhibition Researchers of the City, held in the Atrium of The Hague City Hall.

Study information, Campus Tour Leiden University College

Leiden University College The Hague (LUC) is the international Honours College of Leiden University and offers an innovative Liberal Arts & Sciences undergraduate programme to highly talented and motivated students from all over the world.

The War and Peace Studies track offers you a comprehensive understanding of the historical, theoretical, and practical dimensions of war and peace, while addressing the complex challenges of conflict and peacebuilding in the contemporary world.

This year is the 444th anniversary of Leiden University and we are celebrating this with the residents of the two cities in which the University has a presence: Leiden and The Hague. We are therefore holding an exhibition about the University and its connections to the city in the Atrium of City Hall…

This project maps the policy of ‘Paz Total’ (Total Peace) and ongoing peace negotiations between non-state armed groups and the government of Colombia under the presidency of Gustavo Petro (2022-2026).

Leiden University College The Hague's campus is right next to The Hague Central Station.

Plant diversity is essential for us and our planet as it sustains the stability of our ecosystems, provides vital materials and food to us and supports many ecosystem services.

Plant Sciences' contribution to the Host-Microbe Interactions research theme is to dissect how microorganisms and microbiomes interact with the plant host and the insects on those plants, and how these insights may be harnessed to improve plant growth and health, by steering microbiome composition and…

The Hortus botanicus Leiden has one of Europe’s largest collections of living plants from the Asian region. This rich resource is no longer the sole domain of botanists. Extraordinary professor Paul Kessler studies what the Hortus botanicus Leiden can offer research, higher education and the public…

The overall objectives of my thesis are to investigate the dynamics of the sorghum root microbiome and to explore the beneficial effects of the root microbiome on sorghum growth and stress tolerance.

On the brink of war, what influences decision makers to attack another country? Using innovative theoretical angles, Femke E. Bakker explores whether the basic assumptions of democratic peace theory are indeed correct. She stresses the microfoundations of conflict, questioning the assumptions on…

The Master Population Health Management will equip you with the necessary competences to play a key role in the constantly changing healthcare landscape in which societal, patient and clinical results are all equally relevant.