Hyphessobrycon cachimbensis is a species of South American tetra, belonging to the family Characidae.

Hyphessobrycon cachimbensis has little to no markings excluding a small black spot at the base of the caudal fin.

The species name, cachimbensis, is derived from the Cachimbo River, a waterway in which it resides.

Hyphessobrycon cachimbensis is known to live in the Tapajós River Basin in central Brazil.

This fish is benthopelagic, meaning that it resides away from the surface of the water (suggesting that it consumes both benthic and free floating food sources).