Xenomystax is a genus of in the family Congridae. It currently contains the following species:
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Xenomystax atrarius C. H. Gilbert, 1891 (Deepwater conger)
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Xenomystax austrinus D. G. Smith & Kanazawa, 1989
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Xenomystax bidentatus (Reid, 1940)
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Xenomystax congroides D. G. Smith & Kanazawa, 1989 (Bristletooth conger)
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Xenomystax trucidans Alcock, 1894