This Guide to the archives of intergovernmental organizations is a joint project between UNESCO and the International Council on Archives, Section of Archivists of International Organizations (ICA/SIO). The archives of international organizations are rich sources for contemporary history in general and for the history of international relations in particular. Hopefully, this Guide will be a useful working tool for researchers, students and anyone else wishing to know more about these archives and their holdings. For the time being the Guide includes only major intergovernmental organizations. About 80 intergovernmental organizations have so far been invited to participate. Replies as well as updates of existing contributions will be added as they arrive.[...] The contributions included in this web site are prepared by the participating Organizations. [self-description] The site provides a simple list of the participating organizations with links to their online-services.