Volume 1 (A and B) covers international organizations throughout the world, comprising their aims, activities and events.

For the Yearbook of International Organizations, the most up-to-date and comprehensive reference to international organizations, the UIA has selected the most important 31,086 organizations from its extensive database of current and previous organizations. Yearbook provides profiles of 5,546 intergovernmental and 25,540 international non-governmental organizations active in nearly 300 countries and territories in the world today. Organization descriptions listed in Volume 1 are numbere sequentially to facilitate quick and easy cross-referencing from the other Yearbook Volumes. Users can refer to Volumes 2 and 3 to locate organizations by region or subject respectively, and comprehensive indexes are included. Naturally, the high standards of accuracy, consistency and detail set by previous editions of the Yearbook of International Organizations have been maintained for this edition.