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Union of International Associations

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The Union of International Associations is a Brussels-based nonprofit research institute and documentation center focused on international organizations, meetings, and global problems.

Last updated August 25, 2026

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Overview

The Union of International Associations (UIA) is a nonprofit, nongovernmental research institute and documentation center headquartered in Brussels, Belgium. Established in 1907 as the Central Office of International Associations, it was created by Henri La Fontaine, a Belgian internationalist and recipient of the 1913 Nobel Peace Prize, and Paul Otlet, a pioneer in information science and international documentation. The organization developed from an effort to identify and describe international associations and their activities, initially concentrating on organizations based in Belgium before extending its research to organizations headquartered elsewhere. UIA's central role is to collect, organize, maintain, and disseminate information about international civil society and the wider system of global organizations. Its coverage includes international nongovernmental organizations, intergovernmental organizations, international meetings and congresses, and major world problems. In this capacity, it functions both as a research institution and as a reference repository for historical and current information about cross-border organizational activity. The organization has two closely related public purposes. First, it documents international organizations, their structures, activities, meetings, and areas of concern, helping researchers and the public understand the scale and diversity of international cooperation. Second, it promotes awareness of the work undertaken by international organizations and supports associations through information, networking, and training-related opportunities. Its work therefore combines archival and bibliographic functions with practical support for organizations operating internationally. The UIA's early research was conducted by its founders and later expanded with assistance from sociologist Cyril van Overbergh. The organization also participated in the development of reference literature on international life, including work connected with Alfred Fried and the publication of an independent edition of the Annuaire de la Vie Internationale. In 1923, it published Code des voeux internationaux, a general codification of requests and resolutions issued by international bodies, with a preface by Henri La Fontaine. Among the UIA's continuing areas of activity are information resources concerning international associations, international meetings, and global issues. Its documentation work is associated with major reference resources such as the Yearbook of International Organizations, the International Congress Calendar, and the Encyclopedia of World Problems and Human Potential. These resources make the organization relevant to academics, policymakers, association professionals, meeting planners, journalists, and others studying international institutions and transnational civil society. UIA operates under a United Nations mandate and holds consultative status with the United Nations Economic and Social Council and UNESCO. These relationships reflect its role as an independent information and research organization rather than as a governmental agency or commercial data company. The UIA remains based in Brussels and continues to present itself as an independent center for research, documentation, public awareness, and support for international associations.

History

The Union of International Associations traces its origins to 1907, when Henri La Fontaine and Paul Otlet established the organization under the name Central Office of International Associations. Their initial work focused on building a systematic picture of international organizations headquartered in Belgium. This project reflected a broader interest in international cooperation, institutional networks, and the classification of knowledge about organizations operating across national boundaries. The founders subsequently broadened the scope of the research beyond Belgium. With the assistance of sociologist Cyril van Overbergh, they extended their survey to organizations based in other countries. The resulting work helped establish the institutional and documentary foundations of what would become the UIA: a specialized center devoted to recording the existence, activities, and concerns of international associations and related bodies. The organization was also involved in the production of reference works describing international life. It collaborated with Alfred Fried in connection with the Annuaire de la Vie Internationale and later produced its own edition. This publishing activity became an important part of the UIA's identity, complementing its research and making information about international organizations available in structured reference form. In 1923, the UIA published Code des voeux internationaux, codification générale des voeux et résolutions des organismes internationaux. The work codified requests and resolutions made by international organizations and included a preface by Henri La Fontaine. Its publication illustrates the UIA's early effort to transform scattered records of international activity into organized documentary resources. Over time, the organization developed into a Brussels-based nonprofit research institute and documentation center. Its scope came to include international nongovernmental organizations, intergovernmental organizations, international meetings, and major world problems. The UIA's activities have consequently combined historical preservation with the maintenance of current information about global civil society and international institutional life. The organization's reference and research program is associated with resources including the Yearbook of International Organizations, the International Congress Calendar, and the Encyclopedia of World Problems and Human Potential. These resources support the study of international associations, congresses, meetings, and global issues, and provide practical information for people involved in international cooperation and association management. The UIA also developed a public-facing and service-oriented role. In addition to documenting organizations, it seeks to raise awareness of their work and to support international associations through training and networking opportunities. Its activities are therefore directed both toward researchers and toward organizations that need information, contacts, and institutional knowledge to operate internationally. The UIA operates under a United Nations mandate and has consultative status with ECOSOC and UNESCO. It remains independent and nongovernmental, while its international mandate and consultative relationships place it within the broader ecosystem of organizations concerned with global cooperation. Its continuing base is Brussels, where it maintains its role as a repository and research center for current and historical information on international organizations and world problems.

  • 1923

    Publication of Code des voeux internationaux

    [1]

    The organization published a codification of requests and resolutions issued by international organizations, with a preface by Henri La Fontaine.

  • 1907

    Founded as the Central Office of International Associations

    [1]

    Henri La Fontaine and Paul Otlet established the organization in Brussels to survey and document international associations, initially focusing on organizations headquartered in Belgium.

Products and positioning

An independent, nonprofit knowledge institution serving as a research, documentation, and information hub for international organizations, global meetings, and transnational civil society.

  • Reference publication

    Yearbook of International Organizations

    A major UIA reference resource concerning international organizations. It forms part of the organization's broader documentation program and supports research into the structure, identity, and activities of international associations and related international bodies.

  • Meeting and congress information

    International Congress Calendar

    A reference resource focused on international meetings and congresses. It reflects the UIA's role in recording the global calendar of organized international gatherings and making information about such events available to researchers and association professionals.

  • Research encyclopedia

    Encyclopedia of World Problems and Human Potential

    An encyclopedic research resource addressing world problems and human potential. It extends the UIA's documentation mission beyond organizational directories to the issues, challenges, and possible responses associated with international civil society and global cooperation.

  • Historical publication · 1923

    Code des voeux internationaux

    A 1923 publication that codified requests and resolutions made by international organizations. The work demonstrates the UIA's early commitment to organizing documentary evidence of international institutional activity.

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