国际世界语协会
Grégoire Maertens (born 1 January 1924) is a West-Flemish Esperantist who was a member of the "Estraro" (steering committee) for the UEA ("Universala Esperanto-Asocio" or World Esperanto Association) from 1977 until 1992. From 1980 until 1986 he was president of the UEA, and an honorary member from 1993 onwards.