Priocharax britzi is a minute species of freshwater ray-finned fish belonging to the family Acestrorhamphidae, the American characins. This fish is found in the Rio Negro, Brazil. The species, which has a skeleton of cartilage, is almost completely transparent.
This species reaches a length of .
The fish is named in honor of Ralf Britz, Natural History Museum (London), who described two species in the genus Priocharax.