Union for the International Language Ido (Ido: Uniono por la Linguo Internaciona Ido, ULI) is the official union of the Ido-language movement from 1910.

Based in Amsterdam, Netherlands, its main functions are the propagation of the language, arranging the yearly conferences in which Ido speakers gather, and the publishing of the magazine Progreso (Progress), begun in 1908 by Louis Couturat, one of the founders of the movement who died in 1914.

The ULI organises Ido conventions yearly.

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