Arthur René Jean Baptiste Bavay (29 April 1840 in Lamballe – 1923) was a French pharmacist,herpetologist and malacologist.
Trained as a naval pharmacist, Bavay's scientific contributions included investigations involving the flora and fauna of New Caledonia, migratory studies of mollusks crossing the Suez Canal and research of the malacological families Pectinidae and Marginellidae. With malacologist Philippe Dautzenberg, he conducted studies of terrestrial and freshwater mollusks of the Far East.
He published nearly 70 articles on mollusks, and after his retirement as a pharmacist, he devoted his energies entirely to malacological research. He is credited with providing descriptions of 39 new species and several infraspecific taxa within the family Marginellidae.
His name is associated with the gecko genus Bavayia, named by Jean Roux in 1913, as well as "Bavay's keeled skink" (Tropidophorus baviensis), a species named by René Léon Bourret in 1939. Other species that bear his name are: "Bavay's giant gecko" (Rhacodactylus chahoua) and "Bavay's gecko" (Eurydactylodes vieillardi).