Panaque schaeferi[1] is a freshwater species of fish from the South American armoured catfish family Loricariidae.

Panaque schaeferi is widely distributed throughout the upper Amazon (Solimões River) in Peruvian and Ecuadorian rivers, and it has been observed as far down as Santarém, Brazil.

[1] Growing to at least 60 cm (23.6 inches) SL, it is one of the largest, and likely one of the heaviest species of Loricariid.

Juveniles are often confused with Panaque bathyphilus and erroneously called L090c.

[3] The fish is named in honor of Scott A. Schaefer of the American Museum of Natural History.