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Mecocerculus is a genus of birds in the large tyrant flycatcher family Tyrannidae.

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The buff-banded tyrannulet is a species of bird in the family Tyrannidae. It is found in Argentina, Bolivia, and Peru. Its natural habitat is subtropical or tropical moist montane forests.

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The rufous-winged tyrannulet is a species of bird in the family Tyrannidae. It is found in Ecuador and Peru. Its natural habitats are subtropical or tropical dry forests and subtropical or tropical moist montane forests.

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The sulphur-bellied tyrannulet is a species of bird in the family Tyrannidae. It is found in the eastern Andes of Colombia, Ecuador and Peru. Its natural habitat is subtropical or tropical moist montane forests.

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The white-banded tyrannulet is a species of bird in the family Tyrannidae.

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The white-tailed tyrannulet is a species of bird in the family Tyrannidae.

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The white-throated tyrannulet is a species of bird in the family Tyrannidae.