The rainbow starfrontlet (Coeligena iris) is a species of hummingbird in the "brilliants", tribe Heliantheini in subfamily Lesbiinae.

[6] Males of the nominate subspecies have a glittering yellow-green forecrown that transitions through golden yellow to blue on the crown.

Males of C. i. aurora have a turquoise crown with golden tips to the feathers, a black hindneck, and light chestnut upperparts.

C. i. fulgidiceps is also similar to the nominate but with a blackish neck and upper back and darker chestnut on the underparts.

Males of C. i. eva have a yellowish green forecrown, a dark violet crown, and a coppery hindneck and back.

Examples include those of genera Embothrium, Fuchsia, Iochroma, Mutisia, Salvia, and Tilandsia.

The female builds a cup nest of small twigs, moss, and lichens lined with soft plant fibers.

During aerial chases, the rainbow starfrontlet makes a "thin, wiry chatter, rising and falling, with rattles and squeaky notes".

[1] Its natural habitat is heavily fragmented but the effects of deforestation may be somewhat mitigated by the species' acceptance of human-made landscapes such as gardens and parks.