The World Esperanto Youth Organization is an organization dedicated to supporting young Esperanto speakers around the world and promote the use of Esperanto. TEJO was founded in 1938 as the Tutmonda Junular-Organizo and took its current name in 1952. In 1956, TEJO became the youth section of the Universal Esperanto Association (UEA). In 1971, the finances and administration of TEJO were fully integrated into those of UEA.

The Universal Esperanto Association, also known as the World Esperanto Association, is the largest international organization of Esperanto speakers, with 5501 individual members in 121 countries and 9215 through national associations and in official relations with the United Nations. In addition to individual members, 70 national Esperanto organizations are affiliated with UEA. Its current president is the professor Duncan Charters. The magazine Esperanto is the main organ used by UEA to inform its members about everything happening in the Esperanto community.