The Temminck's mysterious bat (Nycticeius aenobarbus) is a species of bat from the family Vespertilionidae. As the name suggests, there is very little known information about the Temminck's mysterious bat. The species is listed as Data Deficient on the IUCN Red List, and there is no information on population, habitat, ecology, major threats, or conservation actions. Carter and Dolan (1978) have suggested that the one known specimen of the Temminck's mysterious bat is not from South America.