Naturalis Biodiversity Center

University of Applied Sciences Leiden (abbreviated as UAS Leiden; Dutch: Hogeschool Leiden), is a vocational university in the western Netherlands, located in the city of Leiden. It currently has approximately 12,000 students, mainly studying towards associate and bachelor's degrees. The school also offers master's degrees in nursing and physical therapy.

Leiden University Medical Center (Dutch: Leids Universitair Medisch Centrum) or LUMC is the university hospital affiliated with Leiden University, of which it forms the medical faculty. It is located in Leiden, Netherlands. LUMC is a modern university medical center for research, education and patient care. Its research practice ranges from pure fundamental medical research to applied clinical research.

Janssen Vaccines, formerly Crucell, is a biotechnology company specializing in vaccines and biopharmaceutical technologies. It was formed when Johnson & Johnson acquired the Dutch biotech company Crucell based in Leiden and placed it in their pharmaceutical division.

The African Studies Centre (Afrika-Studiecentrum) is a scientific institute in the Netherlands that undertakes social-science research on Africa with the aim of promoting a better understanding of historical, current and future social developments in Sub-Saharan Africa. The centre is an interfaculty institute of Leiden University. The present director is Marleen Dekker. The institute is located in the Pieter de la Court Building of Leiden University’s Faculty of Social Sciences.

IKEA (Swedish: [ɪˈkêːa]) is a Swedish-founded, Dutch-headquartered multinational conglomerate that designs and sells ready-to-assemble furniture, kitchen appliances and home accessories, among other goods and home services. Started in Sweden in 1943 by 17-year-old Ingvar Kamprad, IKEA has been the world's largest furniture retailer since 2008. The brand used by the group is an acronym that consists of the founder's initials, and those of Elmtaryd, the family farm where he was born, and the nearby village Agunnaryd (his hometown in Småland, southern Sweden).The group is known for its modernist designs for various types of appliances and furniture, and its interior design work is often associated with an eco-friendly simplicity. In addition, the firm is known for its attention to cost control, operational details, and continuous product development that has allowed IKEA to lower its prices by an average of two to three percent. INGKA Holding B.V., based in the Netherlands, owns the Ingka Group, which takes care of the centers, retails, customer fulfillment, and all the other services related to IKEA products. At the same time, the IKEA brand is owned and managed by Inter IKEA Systems B.V., based in the Netherlands, owned by Inter IKEA Holding B.V. Inter IKEA Holding is also in charge of design, manufacturing and supply of IKEA products. Ingka Group is a franchisee that pays 3% of royalties to Inter IKEA Systems. As of March 2021, there are 422 IKEA stores operating in 50 countries and in fiscal year 2018, €38.8 billion (US$44.6 billion) worth of IKEA goods were sold. All IKEA stores are operated under franchise from Inter IKEA Systems B.V., most of which are operated by Ingka Group; some of them are operated by other independent owners.The IKEA website contains about 12,000 products and there were over 2.1 billion visitors to IKEA's websites in the year from September 2015 to August 2016. The group is responsible for approximately 1% of world commercial-product wood consumption, making it one of the largest users of wood in the retail sector.

Leiden Centraal is the main railway station in Leiden, a city in the Netherlands.

The Institute of Environmental Sciences (CML) is an institute of the Faculty of Science of Leiden University in the Netherlands. The main area of work is research and education in the multidisciplinary field of environmental sciences. In 2009 the tenured and non tenured staff consists of about 28 fte including 4,5 fte supporting staff. The interdisciplinary character is reflected in the various staff members' backgrounds, such as: ecologists, chemical engineers, agricultural engineers, physicists etc.

Leiden (Dutch: [ˈlɛidə(n)] (listen); in English and archaic Dutch also Leyden) is a city and municipality in the province of South Holland, Netherlands. The municipality of Leiden has a population of 119,713, but the city forms one densely connected agglomeration with its suburbs Oegstgeest, Leiderdorp, Voorschoten and Zoeterwoude with 206,647 inhabitants. The Netherlands Central Bureau of Statistics (CBS) further includes Katwijk in the agglomeration which makes the total population of the Leiden urban agglomeration 270,879, and in the larger Leiden urban area also Teylingen, Noordwijk, and Noordwijkerhout are included with in total 348,868 inhabitants. Leiden is located on the Oude Rijn, at a distance of some 20 kilometres (12 miles) from The Hague to its south and some 40 km (25 mi) from Amsterdam to its north. The recreational area of the Kaag Lakes (Kagerplassen) lies just to the northeast of Leiden. A university city since 1575, Leiden has been one of Europe's most prominent scientific centres for more than four centuries. Leiden is a typical university city, university buildings are scattered throughout the city and the many students from all over the world give the city a bustling, vivid and international atmosphere. Many important scientific discoveries have been made here, giving rise to Leiden's motto: ‘City of Discoveries’. The city houses Leiden University, the oldest university of the Netherlands, and Leiden University Medical Center. Leiden University is one of Europe's top universities, with thirteen Nobel Prize winners. It is a member of the League of European Research Universities and positioned highly in all international academic rankings. It is twinned with Oxford, the location of the United Kingdom's oldest university. Leiden University and Leiden University of Applied Sciences (Leidse Hogeschool) together have around 35,000 students. Modern scientific medical research and teaching started in the early 18th century in Leiden with Boerhaave. Leiden is a city with a rich cultural heritage, not only in science, but also in the arts. One of the world's most famous painters, Rembrandt, was born and educated in Leiden. Other famous Leiden painters include Lucas van Leyden, Jan van Goyen and Jan Steen.

The International Association for Assyriology (IAA) is a non-profit, non-political organization founded in July 2003, and seated in Leiden that "the fields of Cuneiform Studies, ancient Near Eastern History and Archaeology on an international basis and to act as a representative body for these fields in relationship to national, international and private institutions, as well as the general public".According to the Union of International Associations, this organization was founded in "July 2003, London (UK), during International Congress of Assyriology and Near Eastern Archaeology (RAI)" and "registered in accordance with Dutch law."The IAA makes an annual congress, the Rencontre Assyriologique Internationale that assembles scholars from all the world at centres of Near Eastern research. Associations and societies are affiliated like The American Oriental Society, British Institute for the Study of Iraq, Deutsche Orient-Gesellschaft, The Israel Society for Assyriology and Ancient Near Eastern Studies and La Société pour l’étude du Proche-Orient ancien.

Leiden University Libraries is a library founded in 1575 in Leiden, Netherlands. It is regarded as a significant place in the development of European culture: it is a part of a small number of cultural centres that gave direction to the development and spread of knowledge during the Enlightenment. This was due particularly to the simultaneous presence of a unique collection of exceptional sources and scholars. Holdings include approximately 5,200,000 volumes, 1,000,000 e-books, 70,000 e-journals, 2,000 current paper journals, 60,000 Oriental and Western manuscripts, 500,000 letters, 100,000 maps, 100,000 prints, 12,000 drawings and 300,000 photographs. The library manages the largest collections worldwide on Indonesia and the Caribbean. Furthermore, Leiden University Libraries is the only heritage organization in The Netherlands with three registrations of documents in UNESCO's Memory of the World Register. "Est hic magna commoditas bibliothecae ut studiosi possint studere" —Josephus Justus Scaliger"The greatest advantage of the library is that those who want to study, can study."

The Royal Netherlands Institute of Southeast Asian and Caribbean Studies (Dutch: Koninklijk Instituut voor Taal-, Land- en Volkenkunde, lit. 'Royal Institute for the Linguistics, Geography and Ethnology', abbreviated: KITLV) at Leiden was founded in 1851. Its objective is the advancement of the study of the anthropology, linguistics, social sciences, and history of Southeast Asia, the Pacific Area, and the Caribbean. Special emphasis is laid on the former Dutch colonies of the Dutch East Indies (now Indonesia), Suriname, and the Dutch West Indies (the Netherlands Antilles and Aruba). Its unique collection of books, manuscripts, prints and photographs attracts visiting scholars from all over the world. On July 1, 2014, the management of the collection was taken over by Leiden University Libraries.

Oudt Leyden is a restaurant in Leiden in the Netherlands. It is a fine dining restaurant turned pancake-restaurant, that was awarded one Michelin star in 1957 and retained that rating from 1957 to 1979. It was again awarded a Michelin star in 1985 and retained that rating until 1989.Oudt Leyden is one of the founders of Alliance Gastronomique Neerlandaise. In 1967, owner was S.M. Borgerding.