The stripe-breasted starthroat (Heliomaster squamosus) is a species of hummingbird in the "mountain gems", tribe Lampornithini in subfamily Trochilinae.

The tail is green and the outer feathers have a steel blue band near the end and white tips.

[6] The stripe-breasted starthroat is found in eastern Brazil from Pernambuco south to São Paulo state.

[6] The stripe-breasted starthroat is essentially sedentary but may occasionally wander to higher elevations than usual.

[6] The stripe-breasted starthroat's breeding season is usually February to April but it has been recorded incubating in November.

It makes a small cup nest and usually sites it on a horizontal tree branch 6 to 8 m (20 to 30 ft) above the ground.

What is thought to be the stripe-breasted starthroat's song is "a subdued, buzzy scratchy warble 'bzzzrrrr..bzzzrrr..chi-chi-chi-chi..bzrrr'."