Plectrochilus is a genus of pencil catfishes native to South America.

There are currently three recognized species in this genus:[1] P. diabolicus and P. machadoi are found in the Amazon River basin in Brazil and Peru, while P. wieneri is found in the Napo River basin of Ecuador.

[2] P. diabolicus grows to 4.8 centimetres (1.9 in) SL.

[4] Specimens of P. machadoi have been found partially buried in the belly of a specimen of Pseudoplatystoma where it apparently had burrowed through the body wall.

This Trichomycteridae-related article is a stub.