Organizations promoting the dissemination of Esperanto as an international auxiliary language have historically played a prominent role in assisting individuals affected by war and conflict. During the First World War, the Universal Esperanto Association helped members of the general public stranded in foreign countries, with volunteers delivering private correspondence, tracing missing persons, sending food and medicine, repatriating children, and assisting prisoners of war. During the Second World War, international Esperanto organizations performed a similar function, delivering correspondence, assisting refugees, and reuniting families. The following is a list of Esperanto organizations affiliated with the Universal Esperanto Association or the World Anational Association, as well as other independent Esperanto-related groups.

Universal Esperanto Association

National associations linked to the UEA

Africa

Americas

Asia

Central and Eastern Europe

Western and Northern Europe

Middle East

Oceania

World Anational Association

Free Esperanto Associations linked to SAT

Fractions of the SAT

Other associations

Politics

Religion

Science

Institutions