The blue-tufted starthroat (Heliomaster furcifer) is a species of hummingbird in the "mountain gems", tribe Lampornithini in subfamily Trochilinae.

It is found in Argentina, Bolivia, Brazil, Colombia, Paraguay, Peru, Uruguay and possibly Ecuador.

Both sexes of all subspecies have a long, decurved, black bill and a small white spot behind the eye.

The throat and underparts are gray, with a white line down the middle of the belly and green spots on the flanks.

It makes a cup nest of soft fibers covered with lichen, typically sited 3 to 6 m (10 to 20 ft) above the ground.

[6] The IUCN has assessed the blue-tufted starthroat as being of Least Concern, though its population size is unknown and believed to be decreasing.

[1] It is considered rare to locally common at various parts of its large range and occurs in some protected areas.