Inpaichthys is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are found in South America. They are commonly seen in the aquarium trade.

Species Inpaichthys contains the following valid species: Inpaichthys kerri Géry & Junk, 1977 (Royal tetra) Inpaichthys luizae (Dagosta, 2025) Inpaichthys nambiquara (Bertaco & Malabarba, 2007) Inpaichthys parauapiranga Ferreira, Ribeiro, F. C. T. Lima, Silva, Ferreira & Mirande, 2024

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