The hoary puffleg (Haplophaedia lugens) is a species of hummingbird in the "brilliants", tribe Heliantheini in subfamily Lesbiinae.

The underparts are dark gray with a whitish scaly appearance on the throat and breast and a greenish sheen on the flanks.

[6] The hoary puffleg is found in a fairly narrow band on the Pacific slope of the Andes, from southwestern Colombia's Nariño Department south into Ecuador as far as Pichincha Province.

It typically feeds on flowers with short corollas such as Besleria sp., Palicourea sp., Thibaudia sp., Melastomataceae, and Marantaceae.

The nest is a hanging cup or ball made of moss and spiderweb; it is attached to the underside of a fern or other large leaf that protects it from rain.

[1] It is found in a few protected areas but "suitable habitat is rapidly disappearing due to extensive deforestation.