Atelopus nanay, the Sad harlequin frog, is a species of toads in the family Bufonidae. Atelopus nanay is endemic to Ecuador and inhabits subtropical and tropical high-altitude grasslands, rivers, freshwater marshes, and freshwater springs. It is currently threatened by habitat loss and the Batrachochytrium dendrobatidis fungus. The species name nanay stems from the Quechua word for "sadness", which was chosen to bring attention to the decline of Atelopus species in the Ecuadorian Andes, and to express the loss felt by the native Ecuadorian people.

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