Farlowella knerii is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Loricariinae, the mailed catfishes. This catfish is found in Ecuador and Peru. This species reaches a standard length of .
The specific name honors the Austrian ichthyologist Rudolf Kner, a friend and colleague of Franz Steindachner, who also described species in the genus Farlowella.
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