A new species of the genus Ada from southeastern Ecuador is described and illustrated. Ada pygmaea apparently has no close relatives within the genus, and both its plant architecture and floral morphology are somewhat anomalous within Ada. The new taxon is compared with A. brachypus, which it resembles in the small size of the plant and the flowers, the brown tepals and the white, almost immaculate lip. Ada pygmaea can be easily distinguished from A. brachypus, however, by its rhizomatose, repentascending habit, the absence of pseudobulbs, the coriaceous leaves, the 1-to 2-flowered inflorescences, the distinctly smaller flowers, the ovate, truncate, ecallose lip, and the column inflated-convex at the base and provided with a well-developed, petaloid, erose-lacerate clinandrium. Se describe y se ilustra una nueva especie del género Ada del sureste del Ecuador. Aparentemente, dentro del género no se conocen parientes cercanos de Ada pygmaea, y tanto la arquitectura vegetativa así como la morfología floral son anómalas en Ada. El nuevo taxon se compara con A. brachypus, a la cual asemeja por el tamaño reducido de la planta y las flores, los tépalos café y el labelo blanco casi inmaculado. Sin embargo, A. pygmaea se distingue fácilmente de A. brachypus por su hábito rizomatoso, repente-erecto, la carencia de pseudobulbos, las hojas coriáceas, las inflorescencias de 1 o 2 flores, las flores distinctamente más pequeñas, el labelo ovado, truncado y sin callos, y la columna hinchado-convexa en la base y provista de un clinandrio petaloide bien desarrollado, con márgenes eroso-lacerados.
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