Crisilla fallax
{{Short description|Species of gastropod}}
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| image =
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| genus = Crisilla
| species = fallax
| authority = Gofas, 1999{{WRMS source|140620|Gofas S. (1999). The West African Rissoidae (Gastropoda: Rissooidea) and their similarities to some European species. The Nautilus 113(3): 78-101.|08/09/10}}
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Crisilla fallax is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.{{WRMS species|457476|Crisilla fallax Gofas, 1999|||WoRMS (2010). Crisilla fallax Gofas, 1999. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at