The scarlet-bellied mountain tanager is a species of bird in the family Thraupidae and the order Passeriformes. Its measures around 18.5 centimeters.

It is mostly black with a bright scarlet belly. It has a bright scarlet ear patch and a blue patch on the shoulders. It forages in pairs in the mid and upper canopy of humid forests.

 It is found in Bolivia, Colombia, Ecuador, Perú and Venezuela.

Solitary, in pairs, or family groups; often with mixed flocks. Forages at all levels, from bushes at borders to canopy. Vocal year-round, sings both on exposed perch and concealed.