Pristobrycon calmoni is a South American species of serrasalmid fish.

The head is silver with methalic orange to red at mandibular and opercular regions.

The body with greenish laterally and mixture of orange and red at the abdominal area.

Fins are pale except the anal that have the basal rays and membranes yellow or orange and the distal area black.

Its diet occasionally includes fruits from the surrounding gallery forest.