Farlowella hahni 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 Argentina, Brazil and Paraguay where it occurs in the middle Paraná River basin. This species reaches a standard length of . The specific name honours Carlos Hahn, a friend of Hermann Meinken's and "fish connoisseur", of Corrientes who corresponded with Meinken about fishes and who provided the holotype of this species from his collection.
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